diff --git a/core/src/com/unciv/models/ruleset/RulesetCache.kt b/core/src/com/unciv/models/ruleset/RulesetCache.kt
index 9c998bfc22..606a908d40 100644
--- a/core/src/com/unciv/models/ruleset/RulesetCache.kt
+++ b/core/src/com/unciv/models/ruleset/RulesetCache.kt
@@ -9,6 +9,7 @@ import com.unciv.models.metadata.GameParameters
 import com.unciv.models.ruleset.validation.RulesetError
 import com.unciv.models.ruleset.validation.RulesetErrorList
 import com.unciv.models.ruleset.validation.RulesetErrorSeverity
+import com.unciv.models.ruleset.validation.getRelativeTextDistance
 import com.unciv.utils.Log
 import com.unciv.utils.debug
 
@@ -171,9 +172,7 @@ object RulesetCache : HashMap<String, Ruleset>() {
         } catch (ex: UncivShowableException) {
             // This happens if a building is dependent on a tech not in the base ruleset
             //  because newRuleset.updateBuildingCosts() in getComplexRuleset() throws an error
-            RulesetErrorList()
-                .apply { add(ex.message, RulesetErrorSeverity.Error) }
+            RulesetErrorList.of(ex.message, RulesetErrorSeverity.Error)
         }
     }
-
 }
diff --git a/core/src/com/unciv/models/ruleset/unique/Conditionals.kt b/core/src/com/unciv/models/ruleset/unique/Conditionals.kt
index b1b586dd8e..312b31b35e 100644
--- a/core/src/com/unciv/models/ruleset/unique/Conditionals.kt
+++ b/core/src/com/unciv/models/ruleset/unique/Conditionals.kt
@@ -18,7 +18,7 @@ object Conditionals {
     ): Boolean {
 
         if (condition.type?.targetTypes?.any { it.modifierType == UniqueTarget.ModifierType.Other } == true)
-            return true // not a filtering condition
+            return true // not a filtering condition, includes e.g. ModifierHiddenFromUsers
 
         val relevantUnit by lazy {
             if (state.ourCombatant != null && state.ourCombatant is MapUnitCombatant) state.ourCombatant.unit
@@ -109,7 +109,6 @@ object Conditionals {
         return when (condition.type) {
             // These are 'what to do' and not 'when to do' conditionals
             UniqueType.ConditionalTimedUnique -> true
-            UniqueType.ModifierHiddenFromUsers -> true  // allowed to be attached to any Unique to hide it, no-op otherwise
 
             UniqueType.ConditionalChance -> stateBasedRandom.nextFloat() < condition.params[0].toFloat() / 100f
             UniqueType.ConditionalEveryTurns -> checkOnGameInfo { turns % condition.params[0].toInt() == 0 }
diff --git a/core/src/com/unciv/models/ruleset/unique/UniqueTarget.kt b/core/src/com/unciv/models/ruleset/unique/UniqueTarget.kt
index 380d2bdf49..576b91c6d8 100644
--- a/core/src/com/unciv/models/ruleset/unique/UniqueTarget.kt
+++ b/core/src/com/unciv/models/ruleset/unique/UniqueTarget.kt
@@ -7,7 +7,7 @@ package com.unciv.models.ruleset.unique
  * @param inheritsFrom means that all such uniques are acceptable as well. For example, all Global uniques are acceptable for Nations, Eras, etc.
  */
 enum class UniqueTarget(
-    val documentationString:String = "",
+    val documentationString: String = "",
     val inheritsFrom: UniqueTarget? = null,
     val modifierType: ModifierType = ModifierType.None
 ) {
@@ -64,6 +64,7 @@ enum class UniqueTarget(
     TriggerCondition("Special conditionals that can be added to Triggerable uniques, to make them activate upon specific actions.", inheritsFrom = Global, modifierType = ModifierType.Other),
     UnitTriggerCondition("Special conditionals that can be added to UnitTriggerable uniques, to make them activate upon specific actions.", inheritsFrom = TriggerCondition, modifierType = ModifierType.Other),
     UnitActionModifier("Modifiers that can be added to UnitAction uniques as conditionals", modifierType = ModifierType.Other),
+    MetaModifier("Modifiers that can be added to other uniques changing user experience, not their behavior", modifierType = ModifierType.Other),
     ;
 
     /** Whether a UniqueType is allowed in the `<conditional or trigger>` part - or not.
diff --git a/core/src/com/unciv/models/ruleset/unique/UniqueType.kt b/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
index a0bcd1b740..593d14ea97 100644
--- a/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
+++ b/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
@@ -809,7 +809,7 @@ enum class UniqueType(
     HiddenAfterGreatProphet("Hidden after generating a Great Prophet", UniqueTarget.Ruins),
     HiddenWithoutVictoryType("Hidden when [victoryType] Victory is disabled", UniqueTarget.Building, UniqueTarget.Unit, flags = UniqueFlag.setOfHiddenToUsers),
     HiddenFromCivilopedia("Will not be displayed in Civilopedia", *UniqueTarget.Displayable, flags = UniqueFlag.setOfHiddenToUsers),
-    ModifierHiddenFromUsers("hidden from users", UniqueTarget.Conditional),
+    ModifierHiddenFromUsers("hidden from users", UniqueTarget.MetaModifier),
     Comment("Comment [comment]", *UniqueTarget.Displayable,
         docDescription = "Allows displaying arbitrary text in a Unique listing. Only the text within the '[]' brackets will be displayed, the rest serves to allow Ruleset validation to recognize the intent."),
 
diff --git a/core/src/com/unciv/models/ruleset/validation/RulesetErrorList.kt b/core/src/com/unciv/models/ruleset/validation/RulesetErrorList.kt
index ffe97c9df7..a046fcecbf 100644
--- a/core/src/com/unciv/models/ruleset/validation/RulesetErrorList.kt
+++ b/core/src/com/unciv/models/ruleset/validation/RulesetErrorList.kt
@@ -1,6 +1,8 @@
 package com.unciv.models.ruleset.validation
 
 import com.badlogic.gdx.graphics.Color
+import com.unciv.models.ruleset.Ruleset
+import com.unciv.models.ruleset.unique.IHasUniques
 
 class RulesetError(val text: String, val errorSeverityToReport: RulesetErrorSeverity)
 
@@ -11,32 +13,61 @@ enum class RulesetErrorSeverity(val color: Color) {
     Error(Color.RED),
 }
 
-class RulesetErrorList : ArrayList<RulesetError>() {
-    operator fun plusAssign(text: String) {
-        add(text, RulesetErrorSeverity.Error)
+/**
+ *  A container collecting errors in a [Ruleset]
+ *
+ *  While this is based a standard collection, please do not use the standard add, [plusAssign] or [addAll].
+ *  Mod-controlled warning suppression is handled in [add] overloads that provide a source object, which can host suppression uniques.
+ *  Bypassing these add methods means suppression is ignored. Thus using [addAll] is fine when the elements to add are all already checked.
+ *
+ *  //todo This version prepares suppression, but does not actually implement it
+ *
+ *  @param ruleset The ruleset being validated (needed to check modOptions for suppression uniques). Leave `null` only for validation results that need no suppression checks.
+ */
+class RulesetErrorList(
+    ruleset: Ruleset? = null
+) : ArrayList<RulesetError>() {
+    /** Add an [element], preventing duplicates (in which case the highest severity wins).
+     *
+     *  [sourceObject] is for future use and should be the originating object. When it is not known or not a [IHasUniques], pass `null`.
+     */
+    fun add(element: RulesetError, sourceObject: IHasUniques?): Boolean {
+        // Suppression to be checked here
+        return addWithDuplicateCheck(element)
     }
 
-    fun add(text: String, errorSeverityToReport: RulesetErrorSeverity) {
-        add(RulesetError(text, errorSeverityToReport))
-    }
+    /** Shortcut: Add a new [RulesetError] built from [text] and [errorSeverityToReport].
+     *
+     *  [sourceObject] is for future use and should be the originating object. When it is not known or not a [IHasUniques], pass `null`.
+     */
+    fun add(text: String, errorSeverityToReport: RulesetErrorSeverity = RulesetErrorSeverity.Error, sourceObject: IHasUniques?) =
+        add(RulesetError(text, errorSeverityToReport), sourceObject)
 
-    override fun add(element: RulesetError): Boolean {
-        // Suppress duplicates due to the double run of some checks for invariant/specific,
-        // Without changing collection type or making RulesetError obey the equality contract
-        val existing = firstOrNull { it.text == element.text }
-            ?: return super.add(element)
-        if (existing.errorSeverityToReport >= element.errorSeverityToReport) return false
-        remove(existing)
-        return super.add(element)
-    }
+    @Deprecated("No adding without explicit source object", ReplaceWith("add(element, sourceObject)"))
+    override fun add(element: RulesetError) = super.add(element)
 
+    /** Add all [elements] with duplicate check, but without suppression check */
     override fun addAll(elements: Collection<RulesetError>): Boolean {
         var result = false
         for (element in elements)
-            if (add(element)) result = true
+            if (addWithDuplicateCheck(element)) result = true
         return result
     }
 
+    private fun addWithDuplicateCheck(element: RulesetError) =
+        removeLowerSeverityDuplicate(element) && super.add(element)
+
+    /** @return `true` if the element is not present, or it was removed due to having a lower severity */
+    private fun removeLowerSeverityDuplicate(element: RulesetError): Boolean {
+        // Suppress duplicates due to the double run of some checks for invariant/specific,
+        // Without changing collection type or making RulesetError obey the equality contract
+        val existing = firstOrNull { it.text == element.text }
+            ?: return true
+        if (existing.errorSeverityToReport >= element.errorSeverityToReport) return false
+        remove(existing)
+        return true
+    }
+
     fun getFinalSeverity(): RulesetErrorSeverity {
         if (isEmpty()) return RulesetErrorSeverity.OK
         return this.maxOf { it.errorSeverityToReport }
@@ -60,4 +91,17 @@ class RulesetErrorList : ArrayList<RulesetError>() {
                         // out of place. Prevent via kludge:
                         it.text.replace('<','〈').replace('>','〉')
                 }
+
+    companion object {
+        fun of(
+            text: String,
+            severity: RulesetErrorSeverity = RulesetErrorSeverity.Error,
+            ruleset: Ruleset? = null,
+            sourceObject: IHasUniques? = null
+        ): RulesetErrorList {
+            val result = RulesetErrorList(ruleset)
+            result.add(text, severity, sourceObject)
+            return result
+        }
+    }
 }
diff --git a/core/src/com/unciv/models/ruleset/validation/RulesetValidator.kt b/core/src/com/unciv/models/ruleset/validation/RulesetValidator.kt
index 7550e2f465..cb29c6b9f2 100644
--- a/core/src/com/unciv/models/ruleset/validation/RulesetValidator.kt
+++ b/core/src/com/unciv/models/ruleset/validation/RulesetValidator.kt
@@ -36,7 +36,7 @@ class RulesetValidator(val ruleset: Ruleset) {
     }
 
     private fun getNonBaseRulesetErrorList(tryFixUnknownUniques: Boolean): RulesetErrorList {
-        val lines = RulesetErrorList()
+        val lines = RulesetErrorList(ruleset)
 
         // When not checking the entire ruleset, we can only really detect ruleset-invariant errors in uniques
         addModOptionsErrors(lines, tryFixUnknownUniques)
@@ -62,7 +62,7 @@ class RulesetValidator(val ruleset: Ruleset) {
 
         uniqueValidator.populateFilteringUniqueHashsets()
 
-        val lines = RulesetErrorList()
+        val lines = RulesetErrorList(ruleset)
         addModOptionsErrors(lines, tryFixUnknownUniques)
         uniqueValidator.checkUniques(ruleset.globalUniques, lines, true, tryFixUnknownUniques)
 
@@ -106,11 +106,12 @@ class RulesetValidator(val ruleset: Ruleset) {
             UniqueType.ModIsAudioVisualOnly,
             UniqueType.ModIsNotAudioVisual
         )
+        // modOptions is a valid sourceObject, but unnecessary
         if (ruleset.modOptions.uniqueObjects.count { it.type in audioVisualUniqueTypes } > 1)
-            lines += "A mod should only specify one of the 'can/should/cannot be used as permanent audiovisual mod' options."
+            lines.add("A mod should only specify one of the 'can/should/cannot be used as permanent audiovisual mod' options.", sourceObject = null)
         if (!ruleset.modOptions.isBaseRuleset) return
         for (unique in ruleset.modOptions.getMatchingUniques(UniqueType.ModRequires)) {
-            lines += "Mod option '${unique.text}' is invalid for a base ruleset."
+            lines.add("Mod option '${unique.text}' is invalid for a base ruleset.", sourceObject = null)
         }
     }
 
@@ -132,32 +133,34 @@ class RulesetValidator(val ruleset: Ruleset) {
     }
 
     private fun addDifficultyErrors(lines: RulesetErrorList) {
+        // A Difficulty is not a IHasUniques, so not suitable as sourceObject
         for (difficulty in ruleset.difficulties.values) {
             for (unitName in difficulty.aiCityStateBonusStartingUnits + difficulty.aiMajorCivBonusStartingUnits + difficulty.playerBonusStartingUnits)
                 if (unitName != Constants.eraSpecificUnit && !ruleset.units.containsKey(unitName))
-                    lines += "Difficulty ${difficulty.name} contains starting unit $unitName which does not exist!"
+                    lines.add("Difficulty ${difficulty.name} contains starting unit $unitName which does not exist!", sourceObject = null)
         }
     }
 
     private fun addVictoryTypeErrors(lines: RulesetErrorList) {
+        // Victory and Milestone aren't IHasUniques and are unsuitable as sourceObject
         for (victoryType in ruleset.victories.values) {
             for (requiredUnit in victoryType.requiredSpaceshipParts)
                 if (!ruleset.units.contains(requiredUnit))
                     lines.add(
                         "Victory type ${victoryType.name} requires adding the non-existant unit $requiredUnit to the capital to win!",
-                        RulesetErrorSeverity.Warning
+                        RulesetErrorSeverity.Warning, sourceObject = null
                     )
             for (milestone in victoryType.milestoneObjects)
                 if (milestone.type == null)
                     lines.add(
                         "Victory type ${victoryType.name} has milestone ${milestone.uniqueDescription} that is of an unknown type!",
-                        RulesetErrorSeverity.Error
+                        RulesetErrorSeverity.Error, sourceObject = null
                     )
             for (victory in ruleset.victories.values)
                 if (victory.name != victoryType.name && victory.milestones == victoryType.milestones)
                     lines.add(
                         "Victory types ${victoryType.name} and ${victory.name} have the same requirements!",
-                        RulesetErrorSeverity.Warning
+                        RulesetErrorSeverity.Warning, sourceObject = null
                     )
         }
     }
@@ -183,12 +186,12 @@ class RulesetValidator(val ruleset: Ruleset) {
                 if (!ruleset.unitPromotions.containsKey(prereq))
                     lines.add(
                         "${promotion.name} requires promotion $prereq which does not exist!",
-                        RulesetErrorSeverity.Warning
+                        RulesetErrorSeverity.Warning, promotion
                     )
             for (unitType in promotion.unitTypes) checkUnitType(unitType) {
                 lines.add(
                     "${promotion.name} references unit type $unitType, which does not exist!",
-                    RulesetErrorSeverity.Warning
+                    RulesetErrorSeverity.Warning, promotion
                 )
             }
             uniqueValidator.checkUniques(promotion, lines, true, tryFixUnknownUniques)
@@ -202,10 +205,10 @@ class RulesetValidator(val ruleset: Ruleset) {
     ) {
         for (reward in ruleset.ruinRewards.values) {
             @Suppress("KotlinConstantConditions") // data is read from json, so any assumptions may be wrong
-            if (reward.weight < 0) lines += "${reward.name} has a negative weight, which is not allowed!"
+            if (reward.weight < 0) lines.add("${reward.name} has a negative weight, which is not allowed!", sourceObject = reward)
             for (difficulty in reward.excludedDifficulties)
                 if (!ruleset.difficulties.containsKey(difficulty))
-                    lines += "${reward.name} references difficulty ${difficulty}, which does not exist!"
+                    lines.add("${reward.name} references difficulty ${difficulty}, which does not exist!", sourceObject = reward)
             uniqueValidator.checkUniques(reward, lines, true, tryFixUnknownUniques)
         }
     }
@@ -218,18 +221,18 @@ class RulesetValidator(val ruleset: Ruleset) {
             if (policy.requires != null)
                 for (prereq in policy.requires!!)
                     if (!ruleset.policies.containsKey(prereq))
-                        lines += "${policy.name} requires policy $prereq which does not exist!"
+                        lines.add("${policy.name} requires policy $prereq which does not exist!", sourceObject = policy)
             uniqueValidator.checkUniques(policy, lines, true, tryFixUnknownUniques)
         }
 
         for (branch in ruleset.policyBranches.values)
             if (branch.era !in ruleset.eras)
-                lines += "${branch.name} requires era ${branch.era} which does not exist!"
+                lines.add("${branch.name} requires era ${branch.era} which does not exist!", sourceObject = branch)
 
 
         for (policy in ruleset.policyBranches.values.flatMap { it.policies + it })
             if (policy != ruleset.policies[policy.name])
-                lines += "More than one policy with the name ${policy.name} exists!"
+                lines.add("More than one policy with the name ${policy.name} exists!", sourceObject = policy)
 
     }
 
@@ -243,9 +246,9 @@ class RulesetValidator(val ruleset: Ruleset) {
             uniqueValidator.checkUniques(nation, lines, true, tryFixUnknownUniques)
 
             if (nation.cityStateType != null && nation.cityStateType !in ruleset.cityStateTypes)
-                lines += "${nation.name} is of city-state type ${nation.cityStateType} which does not exist!"
+                lines.add("${nation.name} is of city-state type ${nation.cityStateType} which does not exist!", sourceObject = nation)
             if (nation.favoredReligion != null && nation.favoredReligion !in ruleset.religions)
-                lines += "${nation.name} has ${nation.favoredReligion} as their favored religion, which does not exist!"
+                lines.add("${nation.name} has ${nation.favoredReligion} as their favored religion, which does not exist!", sourceObject = nation)
         }
     }
 
@@ -255,7 +258,7 @@ class RulesetValidator(val ruleset: Ruleset) {
     ) {
         for (belief in ruleset.beliefs.values) {
             if (belief.type == BeliefType.Any || belief.type == BeliefType.None)
-                lines += "${belief.name} type is {belief.type}, which is not allowed!"
+                lines.add("${belief.name} type is ${belief.type}, which is not allowed!", sourceObject = belief)
             uniqueValidator.checkUniques(belief, lines, true, tryFixUnknownUniques)
         }
     }
@@ -263,9 +266,9 @@ class RulesetValidator(val ruleset: Ruleset) {
     private fun addSpeedErrors(lines: RulesetErrorList) {
         for (speed in ruleset.speeds.values) {
             if (speed.modifier < 0f)
-                lines += "Negative speed modifier for game speed ${speed.name}"
+                lines.add("Negative speed modifier for game speed ${speed.name}", sourceObject = speed)
             if (speed.yearsPerTurn.isEmpty())
-                lines += "Empty turn increment list for game speed ${speed.name}"
+                lines.add("Empty turn increment list for game speed ${speed.name}", sourceObject = speed)
         }
     }
 
@@ -274,7 +277,7 @@ class RulesetValidator(val ruleset: Ruleset) {
         tryFixUnknownUniques: Boolean
     ) {
         if (ruleset.eras.isEmpty()) {
-            lines += "Eras file is empty! This will likely lead to crashes. Ask the mod maker to update this mod!"
+            lines.add("Eras file is empty! This will likely lead to crashes. Ask the mod maker to update this mod!", sourceObject = null)
         }
 
         val allDifficultiesStartingUnits = hashSetOf<String>()
@@ -287,38 +290,38 @@ class RulesetValidator(val ruleset: Ruleset) {
         for (era in ruleset.eras.values) {
             for (wonder in era.startingObsoleteWonders)
                 if (wonder !in ruleset.buildings)
-                    lines += "Nonexistent wonder $wonder obsoleted when starting in ${era.name}!"
+                    lines.add("Nonexistent wonder $wonder obsoleted when starting in ${era.name}!", sourceObject = era)
             for (building in era.settlerBuildings)
                 if (building !in ruleset.buildings)
-                    lines += "Nonexistent building $building built by settlers when starting in ${era.name}"
+                    lines.add("Nonexistent building $building built by settlers when starting in ${era.name}", sourceObject = era)
             // todo the whole 'starting unit' thing needs to be redone, there's no reason we can't have a single list containing all the starting units.
             if (era.startingSettlerUnit !in ruleset.units
                 && ruleset.units.values.none { it.isCityFounder() }
             )
-                lines += "Nonexistent unit ${era.startingSettlerUnit} marked as starting unit when starting in ${era.name}"
+                lines.add("Nonexistent unit ${era.startingSettlerUnit} marked as starting unit when starting in ${era.name}", sourceObject = era)
             if (era.startingWorkerCount != 0 && era.startingWorkerUnit !in ruleset.units
                 && ruleset.units.values.none { it.hasUnique(UniqueType.BuildImprovements) }
             )
-                lines += "Nonexistent unit ${era.startingWorkerUnit} marked as starting unit when starting in ${era.name}"
+                lines.add("Nonexistent unit ${era.startingWorkerUnit} marked as starting unit when starting in ${era.name}", sourceObject = era)
 
             val grantsStartingMilitaryUnit = era.startingMilitaryUnitCount != 0
                 || allDifficultiesStartingUnits.contains(Constants.eraSpecificUnit)
             if (grantsStartingMilitaryUnit && era.startingMilitaryUnit !in ruleset.units)
-                lines += "Nonexistent unit ${era.startingMilitaryUnit} marked as starting unit when starting in ${era.name}"
+                lines.add("Nonexistent unit ${era.startingMilitaryUnit} marked as starting unit when starting in ${era.name}", sourceObject = era)
             if (era.researchAgreementCost < 0 || era.startingSettlerCount < 0 || era.startingWorkerCount < 0 || era.startingMilitaryUnitCount < 0 || era.startingGold < 0 || era.startingCulture < 0)
-                lines += "Unexpected negative number found while parsing era ${era.name}"
+                lines.add("Unexpected negative number found while parsing era ${era.name}", sourceObject = era)
             if (era.settlerPopulation <= 0)
-                lines += "Population in cities from settlers must be strictly positive! Found value ${era.settlerPopulation} for era ${era.name}"
+                lines.add("Population in cities from settlers must be strictly positive! Found value ${era.settlerPopulation} for era ${era.name}", sourceObject = era)
 
             if (era.allyBonus.isNotEmpty())
                 lines.add(
                     "Era ${era.name} contains city-state bonuses. City-state bonuses are now defined in CityStateType.json",
-                    RulesetErrorSeverity.WarningOptionsOnly
+                    RulesetErrorSeverity.WarningOptionsOnly, era
                 )
             if (era.friendBonus.isNotEmpty())
                 lines.add(
                     "Era ${era.name} contains city-state bonuses. City-state bonuses are now defined in CityStateType.json",
-                    RulesetErrorSeverity.WarningOptionsOnly
+                    RulesetErrorSeverity.WarningOptionsOnly, era
                 )
 
             uniqueValidator.checkUniques(era, lines, true, tryFixUnknownUniques)
@@ -332,20 +335,20 @@ class RulesetValidator(val ruleset: Ruleset) {
         for (tech in ruleset.technologies.values) {
             for (prereq in tech.prerequisites) {
                 if (!ruleset.technologies.containsKey(prereq))
-                    lines += "${tech.name} requires tech $prereq which does not exist!"
+                    lines.add("${tech.name} requires tech $prereq which does not exist!", sourceObject = tech)
 
                 if (tech.prerequisites.any { it != prereq && getPrereqTree(it).contains(prereq) }) {
                     lines.add(
                         "No need to add $prereq as a prerequisite of ${tech.name} - it is already implicit from the other prerequisites!",
-                        RulesetErrorSeverity.Warning
+                        RulesetErrorSeverity.Warning, tech
                     )
                 }
 
                 if (getPrereqTree(prereq).contains(tech.name))
-                    lines += "Techs ${tech.name} and $prereq require each other!"
+                    lines.add("Techs ${tech.name} and $prereq require each other!", sourceObject = tech)
             }
             if (tech.era() !in ruleset.eras)
-                lines += "Unknown era ${tech.era()} referenced in column of tech ${tech.name}"
+                lines.add("Unknown era ${tech.era()} referenced in column of tech ${tech.name}", sourceObject = tech)
             uniqueValidator.checkUniques(tech, lines, true, tryFixUnknownUniques)
         }
     }
@@ -355,25 +358,25 @@ class RulesetValidator(val ruleset: Ruleset) {
         tryFixUnknownUniques: Boolean
     ) {
         if (ruleset.terrains.values.none { it.type == TerrainType.Land && !it.impassable })
-            lines += "No passable land terrains exist!"
+            lines.add("No passable land terrains exist!", sourceObject = null)
 
         for (terrain in ruleset.terrains.values) {
             for (baseTerrainName in terrain.occursOn) {
                 val baseTerrain = ruleset.terrains[baseTerrainName]
                 if (baseTerrain == null)
-                    lines += "${terrain.name} occurs on terrain $baseTerrainName which does not exist!"
+                    lines.add("${terrain.name} occurs on terrain $baseTerrainName which does not exist!", sourceObject = terrain)
                 else if (baseTerrain.type == TerrainType.NaturalWonder)
-                    lines.add("${terrain.name} occurs on natural wonder $baseTerrainName: Unsupported.", RulesetErrorSeverity.WarningOptionsOnly)
+                    lines.add("${terrain.name} occurs on natural wonder $baseTerrainName: Unsupported.", RulesetErrorSeverity.WarningOptionsOnly, terrain)
             }
             if (terrain.type == TerrainType.NaturalWonder) {
                 if (terrain.turnsInto == null)
-                    lines += "Natural Wonder ${terrain.name} is missing the turnsInto attribute!"
+                    lines.add("Natural Wonder ${terrain.name} is missing the turnsInto attribute!", sourceObject = terrain)
                 val baseTerrain = ruleset.terrains[terrain.turnsInto]
                 if (baseTerrain == null)
-                    lines += "${terrain.name} turns into terrain ${terrain.turnsInto} which does not exist!"
+                    lines.add("${terrain.name} turns into terrain ${terrain.turnsInto} which does not exist!", sourceObject = terrain)
                 else if (!baseTerrain.type.isBaseTerrain)
                     // See https://github.com/hackedpassword/Z2/blob/main/HybridTileTech.md for a clever exploit
-                    lines.add("${terrain.name} turns into terrain ${terrain.turnsInto} which is not a base terrain!", RulesetErrorSeverity.Warning)
+                    lines.add("${terrain.name} turns into terrain ${terrain.turnsInto} which is not a base terrain!", RulesetErrorSeverity.Warning, terrain)
             }
             uniqueValidator.checkUniques(terrain, lines, true, tryFixUnknownUniques)
         }
@@ -385,10 +388,10 @@ class RulesetValidator(val ruleset: Ruleset) {
     ) {
         for (improvement in ruleset.tileImprovements.values) {
             if (improvement.techRequired != null && !ruleset.technologies.containsKey(improvement.techRequired!!))
-                lines += "${improvement.name} requires tech ${improvement.techRequired} which does not exist!"
+                lines.add("${improvement.name} requires tech ${improvement.techRequired} which does not exist!", sourceObject = improvement)
             for (terrain in improvement.terrainsCanBeBuiltOn)
                 if (!ruleset.terrains.containsKey(terrain) && terrain != "Land" && terrain != "Water")
-                    lines += "${improvement.name} can be built on terrain $terrain which does not exist!"
+                    lines.add("${improvement.name} can be built on terrain $terrain which does not exist!", sourceObject = improvement)
             if (improvement.terrainsCanBeBuiltOn.isEmpty()
                 && !improvement.hasUnique(UniqueType.CanOnlyImproveResource)
                 && !improvement.hasUnique(UniqueType.Unbuildable)
@@ -398,7 +401,7 @@ class RulesetValidator(val ruleset: Ruleset) {
             ) {
                 lines.add(
                     "${improvement.name} has an empty `terrainsCanBeBuiltOn`, isn't allowed to only improve resources and isn't unbuildable! Support for this will soon end. Either give this the unique \"Unbuildable\", \"Can only be built to improve a resource\" or add \"Land\", \"Water\" or any other value to `terrainsCanBeBuiltOn`.",
-                    RulesetErrorSeverity.Warning
+                    RulesetErrorSeverity.Warning, improvement
                 )
             }
             for (unique in improvement.uniqueObjects
@@ -407,7 +410,7 @@ class RulesetValidator(val ruleset: Ruleset) {
                 val params = Stats.parse(unique.params[0])
                 if (params.values.any { it < 0 }) lines.add(
                     "${improvement.name} cannot have a negative value for a pillage yield!",
-                    RulesetErrorSeverity.Error
+                    RulesetErrorSeverity.Error, improvement
                 )
             }
 
@@ -416,7 +419,7 @@ class RulesetValidator(val ruleset: Ruleset) {
             if (hasPillageUnique && improvement.hasUnique(UniqueType.Unpillagable, StateForConditionals.IgnoreConditionals)) {
                 lines.add(
                     "${improvement.name} has both an `Unpillagable` unique type and a `PillageYieldRandom` or `PillageYieldFixed` unique type!",
-                    RulesetErrorSeverity.Warning
+                    RulesetErrorSeverity.Warning, improvement
                 )
             }
             uniqueValidator.checkUniques(improvement, lines, true, tryFixUnknownUniques)
@@ -429,26 +432,27 @@ class RulesetValidator(val ruleset: Ruleset) {
     ) {
         for (resource in ruleset.tileResources.values) {
             if (resource.revealedBy != null && !ruleset.technologies.containsKey(resource.revealedBy!!))
-                lines += "${resource.name} revealed by tech ${resource.revealedBy} which does not exist!"
+                lines.add("${resource.name} revealed by tech ${resource.revealedBy} which does not exist!", sourceObject = resource)
             if (resource.improvement != null && !ruleset.tileImprovements.containsKey(resource.improvement!!))
-                lines += "${resource.name} improved by improvement ${resource.improvement} which does not exist!"
+                lines.add("${resource.name} improved by improvement ${resource.improvement} which does not exist!", sourceObject = resource)
             for (improvement in resource.improvedBy)
                 if (!ruleset.tileImprovements.containsKey(improvement))
-                    lines += "${resource.name} improved by improvement $improvement which does not exist!"
+                    lines.add("${resource.name} improved by improvement $improvement which does not exist!", sourceObject = resource)
             for (terrain in resource.terrainsCanBeFoundOn)
                 if (!ruleset.terrains.containsKey(terrain))
-                    lines += "${resource.name} can be found on terrain $terrain which does not exist!"
+                    lines.add("${resource.name} can be found on terrain $terrain which does not exist!", sourceObject = resource)
             uniqueValidator.checkUniques(resource, lines, true, tryFixUnknownUniques)
         }
     }
 
     private fun addSpecialistErrors(lines: RulesetErrorList) {
+        // Specialist is not a IHasUniques and unsuitable as sourceObject
         for (specialist in ruleset.specialists.values) {
             for (gpp in specialist.greatPersonPoints)
                 if (gpp.key !in ruleset.units)
                     lines.add(
                         "Specialist ${specialist.name} has greatPersonPoints for ${gpp.key}, which is not a unit in the ruleset!",
-                        RulesetErrorSeverity.Warning
+                        RulesetErrorSeverity.Warning, sourceObject = null
                     )
         }
     }
@@ -462,17 +466,17 @@ class RulesetValidator(val ruleset: Ruleset) {
 
             for (requiredTech: String in building.requiredTechs())
                 if (!ruleset.technologies.containsKey(requiredTech))
-                    lines += "${building.name} requires tech $requiredTech which does not exist!"
+                    lines.add("${building.name} requires tech $requiredTech which does not exist!", sourceObject = building)
             for (specialistName in building.specialistSlots.keys)
                 if (!ruleset.specialists.containsKey(specialistName))
-                    lines += "${building.name} provides specialist $specialistName which does not exist!"
+                    lines.add("${building.name} provides specialist $specialistName which does not exist!", sourceObject = building)
             for (resource in building.getResourceRequirementsPerTurn(StateForConditionals.IgnoreConditionals).keys)
                 if (!ruleset.tileResources.containsKey(resource))
-                    lines += "${building.name} requires resource $resource which does not exist!"
+                    lines.add("${building.name} requires resource $resource which does not exist!", sourceObject = building)
             if (building.replaces != null && !ruleset.buildings.containsKey(building.replaces!!))
-                lines += "${building.name} replaces ${building.replaces} which does not exist!"
+                lines.add("${building.name} replaces ${building.replaces} which does not exist!", sourceObject = building)
             if (building.requiredBuilding != null && !ruleset.buildings.containsKey(building.requiredBuilding!!))
-                lines += "${building.name} requires ${building.requiredBuilding} which does not exist!"
+                lines.add("${building.name} requires ${building.requiredBuilding} which does not exist!", sourceObject = building)
             uniqueValidator.checkUniques(building, lines, true, tryFixUnknownUniques)
         }
     }
@@ -493,7 +497,7 @@ class RulesetValidator(val ruleset: Ruleset) {
         tryFixUnknownUniques: Boolean
     ) {
         if (ruleset.units.values.none { it.isCityFounder() })
-            lines += "No city-founding units in ruleset!"
+            lines.add("No city-founding units in ruleset!", sourceObject = null)
 
         for (unit in ruleset.units.values) {
             checkUnitRulesetInvariant(unit, lines)
@@ -523,12 +527,12 @@ class RulesetValidator(val ruleset: Ruleset) {
     }
 
     private fun addPromotionErrorRulesetInvariant(promotion: Promotion, lines: RulesetErrorList) {
-        if (promotion.row < -1) lines += "Promotion ${promotion.name} has invalid row value: ${promotion.row}"
-        if (promotion.column < 0) lines += "Promotion ${promotion.name} has invalid column value: ${promotion.column}"
+        if (promotion.row < -1) lines.add("Promotion ${promotion.name} has invalid row value: ${promotion.row}", sourceObject = promotion)
+        if (promotion.column < 0) lines.add("Promotion ${promotion.name} has invalid column value: ${promotion.column}", sourceObject = promotion)
         if (promotion.row == -1) return
         for (otherPromotion in ruleset.unitPromotions.values)
             if (promotion != otherPromotion && promotion.column == otherPromotion.column && promotion.row == otherPromotion.row)
-                lines += "Promotions ${promotion.name} and ${otherPromotion.name} have the same position: ${promotion.row}/${promotion.column}"
+                lines.add("Promotions ${promotion.name} and ${otherPromotion.name} have the same position: ${promotion.row}/${promotion.column}", sourceObject = promotion)
     }
 
     private fun addNationErrorsRulesetInvariant(
@@ -543,23 +547,20 @@ class RulesetValidator(val ruleset: Ruleset) {
 
     private fun addNationErrorRulesetInvariant(nation: Nation, lines: RulesetErrorList) {
         if (nation.cities.isEmpty() && !nation.isSpectator && !nation.isBarbarian) {
-            lines += "${nation.name} can settle cities, but has no city names!"
+            lines.add("${nation.name} can settle cities, but has no city names!", sourceObject = nation)
         }
 
         // https://www.w3.org/TR/WCAG20/#visual-audio-contrast-contrast
         val constrastRatio = nation.getContrastRatio()
         if (constrastRatio < 3) {
-            val suggestedColors = getSuggestedColors(nation)
-            val newOuterColor = suggestedColors.outerColor
-            val newInnerColor = suggestedColors.innerColor
+            val (newInnerColor, newOuterColor) = getSuggestedColors(nation)
 
             var text = "${nation.name}'s colors do not contrast enough - it is unreadable!"
             text += "\nSuggested colors: "
             text += "\n\t\t\"outerColor\": [${(newOuterColor.r * 255).toInt()}, ${(newOuterColor.g * 255).toInt()}, ${(newOuterColor.b * 255).toInt()}],"
             text += "\n\t\t\"innerColor\": [${(newInnerColor.r * 255).toInt()}, ${(newInnerColor.g * 255).toInt()}, ${(newInnerColor.b * 255).toInt()}],"
 
-            lines.add(text, RulesetErrorSeverity.WarningOptionsOnly)
-            lines.add(text, RulesetErrorSeverity.WarningOptionsOnly)
+            lines.add(text, RulesetErrorSeverity.WarningOptionsOnly, nation)
         }
     }
 
@@ -609,37 +610,38 @@ class RulesetValidator(val ruleset: Ruleset) {
         )
             lines.add(
                 "${building.name} is buildable and therefore should either have an explicit cost or reference an existing tech!",
-                RulesetErrorSeverity.Warning
+                RulesetErrorSeverity.Warning, building
             )
 
         for (gpp in building.greatPersonPoints)
             if (gpp.key !in ruleset.units)
                 lines.add(
                     "Building ${building.name} has greatPersonPoints for ${gpp.key}, which is not a unit in the ruleset!",
-                    RulesetErrorSeverity.Warning
+                    RulesetErrorSeverity.Warning, building
                 )
     }
 
     private fun addTechColumnErrorsRulesetInvariant(lines: RulesetErrorList) {
+        // TechColumn is not a IHasUniques and unsuitable as sourceObject
         for (techColumn in ruleset.techColumns) {
             if (techColumn.columnNumber < 0)
-                lines += "Tech Column number ${techColumn.columnNumber} is negative"
+                lines.add("Tech Column number ${techColumn.columnNumber} is negative", sourceObject = null)
             if (techColumn.buildingCost == -1)
                 lines.add(
                     "Tech Column number ${techColumn.columnNumber} has no explicit building cost",
-                    RulesetErrorSeverity.Warning
+                    RulesetErrorSeverity.Warning, sourceObject = null
                 )
             if (techColumn.wonderCost == -1)
                 lines.add(
                     "Tech Column number ${techColumn.columnNumber} has no explicit wonder cost",
-                    RulesetErrorSeverity.Warning
+                    RulesetErrorSeverity.Warning, sourceObject = null
                 )
         }
 
         for (tech in ruleset.technologies.values) {
             for (otherTech in ruleset.technologies.values) {
                 if (tech != otherTech && otherTech.column?.columnNumber == tech.column?.columnNumber && otherTech.row == tech.row)
-                    lines += "${tech.name} is in the same row and column as ${otherTech.name}!"
+                    lines.add("${tech.name} is in the same row and column as ${otherTech.name}!", sourceObject = tech)
             }
         }
     }
@@ -673,23 +675,23 @@ class RulesetValidator(val ruleset: Ruleset) {
     private fun checkUnitRulesetInvariant(unit: BaseUnit, lines: RulesetErrorList) {
         for (upgradesTo in unit.getUpgradeUnits(StateForConditionals.IgnoreConditionals)) {
             if (upgradesTo == unit.name || (upgradesTo == unit.replaces))
-                lines += "${unit.name} upgrades to itself!"
+                lines.add("${unit.name} upgrades to itself!", sourceObject = unit)
         }
         if (unit.isMilitary() && unit.strength == 0)  // Should only match ranged units with 0 strength
-            lines += "${unit.name} is a military unit but has no assigned strength!"
+            lines.add("${unit.name} is a military unit but has no assigned strength!", sourceObject = unit)
     }
 
     /** Collects all RulesetSpecific checks for a BaseUnit */
     private fun checkUnitRulesetSpecific(unit: BaseUnit, lines: RulesetErrorList) {
         for (requiredTech: String in unit.requiredTechs())
             if (!ruleset.technologies.containsKey(requiredTech))
-                lines += "${unit.name} requires tech $requiredTech which does not exist!"
+                lines.add("${unit.name} requires tech $requiredTech which does not exist!", sourceObject = unit)
         for (obsoleteTech: String in unit.techsAtWhichNoLongerAvailable())
             if (!ruleset.technologies.containsKey(obsoleteTech))
-                lines += "${unit.name} obsoletes at tech $obsoleteTech which does not exist!"
+                lines.add("${unit.name} obsoletes at tech $obsoleteTech which does not exist!", sourceObject = unit)
         for (upgradesTo in unit.getUpgradeUnits(StateForConditionals.IgnoreConditionals))
             if (!ruleset.units.containsKey(upgradesTo))
-                lines += "${unit.name} upgrades to unit $upgradesTo which does not exist!"
+                lines.add("${unit.name} upgrades to unit $upgradesTo which does not exist!", sourceObject = unit)
 
         // Check that we don't obsolete ourselves before we can upgrade
         for (obsoleteTech: String in unit.techsAtWhichAutoUpgradeInProduction())
@@ -702,20 +704,20 @@ class RulesetValidator(val ruleset: Ruleset) {
                         lines.add(
                             "${unit.name} is supposed to automatically upgrade at tech ${obsoleteTech}," +
                                 " and therefore $requiredTech for its upgrade ${upgradedUnit.name} may not yet be researched!",
-                            RulesetErrorSeverity.Warning
+                            RulesetErrorSeverity.Warning, unit
                         )
             }
 
         for (resource in unit.getResourceRequirementsPerTurn(StateForConditionals.IgnoreConditionals).keys)
             if (!ruleset.tileResources.containsKey(resource))
-                lines += "${unit.name} requires resource $resource which does not exist!"
+                lines.add("${unit.name} requires resource $resource which does not exist!", sourceObject = unit)
         if (unit.replaces != null && !ruleset.units.containsKey(unit.replaces!!))
-            lines += "${unit.name} replaces ${unit.replaces} which does not exist!"
+            lines.add("${unit.name} replaces ${unit.replaces} which does not exist!", sourceObject = unit)
         for (promotion in unit.promotions)
             if (!ruleset.unitPromotions.containsKey(promotion))
-                lines += "${unit.name} contains promotion $promotion which does not exist!"
+                lines.add("${unit.name} contains promotion $promotion which does not exist!", sourceObject = unit)
         checkUnitType(unit.unitType) {
-            lines += "${unit.name} is of type ${unit.unitType}, which does not exist!"
+            lines.add("${unit.name} is of type ${unit.unitType}, which does not exist!", sourceObject = unit)
         }
 
         // We should ignore conditionals here - there are condition implementations on this out there that require a game state (and will test false without)
@@ -726,7 +728,7 @@ class RulesetValidator(val ruleset: Ruleset) {
                 unit.isCivilian() &&
                 !unit.isGreatPersonOfType("War")) {
                 lines.add("${unit.name} can place improvement $improvementName which has no stats, preventing unit automation!",
-                    RulesetErrorSeverity.WarningOptionsOnly)
+                    RulesetErrorSeverity.WarningOptionsOnly, unit)
             }
         }
     }
@@ -763,31 +765,31 @@ class RulesetValidator(val ruleset: Ruleset) {
                     allFallbacks.add(config.fallbackTileSet!!)
             } catch (ex: Exception) {
                 // Our fromJsonFile wrapper already intercepts Exceptions and gives them a generalized message, so go a level deeper for useful details (like "unmatched brace")
-                lines.add("Tileset config '${file.name()}' cannot be loaded (${ex.cause?.message})", RulesetErrorSeverity.Warning)
+                lines.add("Tileset config '${file.name()}' cannot be loaded (${ex.cause?.message})", RulesetErrorSeverity.Warning, sourceObject = null)
             }
         }
 
         // Folder should not contain subdirectories, non-json files, or be empty
         if (folderContentBad)
-            lines.add("The Mod tileset config folder contains non-json files or subdirectories", RulesetErrorSeverity.Warning)
+            lines.add("The Mod tileset config folder contains non-json files or subdirectories", RulesetErrorSeverity.Warning, sourceObject = null)
         if (configTilesets.isEmpty())
-            lines.add("The Mod tileset config folder contains no json files", RulesetErrorSeverity.Warning)
+            lines.add("The Mod tileset config folder contains no json files", RulesetErrorSeverity.Warning, sourceObject = null)
 
         // There should be atlas images corresponding to each json name
         val atlasTilesets = getTilesetNamesFromAtlases()
         val configOnlyTilesets = configTilesets - atlasTilesets
         if (configOnlyTilesets.isNotEmpty())
-            lines.add("Mod has no graphics for configured tilesets: ${configOnlyTilesets.joinToString()}", RulesetErrorSeverity.Warning)
+            lines.add("Mod has no graphics for configured tilesets: ${configOnlyTilesets.joinToString()}", RulesetErrorSeverity.Warning, sourceObject = null)
 
         // For all atlas images matching "TileSets/*" there should be a json
         val atlasOnlyTilesets = atlasTilesets - configTilesets
         if (atlasOnlyTilesets.isNotEmpty())
-            lines.add("Mod has no configuration for tileset graphics: ${atlasOnlyTilesets.joinToString()}", RulesetErrorSeverity.Warning)
+            lines.add("Mod has no configuration for tileset graphics: ${atlasOnlyTilesets.joinToString()}", RulesetErrorSeverity.Warning, sourceObject = null)
 
         // All fallbacks should exist (default added because TileSetCache is not loaded when running as unit test)
         val unknownFallbacks = allFallbacks - TileSetCache.keys - Constants.defaultFallbackTileset
         if (unknownFallbacks.isNotEmpty())
-            lines.add("Fallback tileset invalid: ${unknownFallbacks.joinToString()}", RulesetErrorSeverity.Warning)
+            lines.add("Fallback tileset invalid: ${unknownFallbacks.joinToString()}", RulesetErrorSeverity.Warning, sourceObject = null)
     }
 
     private fun getTilesetNamesFromAtlases(): Set<String> {
@@ -810,7 +812,7 @@ class RulesetValidator(val ruleset: Ruleset) {
         fun recursiveCheck(history: HashSet<Promotion>, promotion: Promotion, level: Int) {
             if (promotion in history) {
                 lines.add("Circular Reference in Promotions: ${history.joinToString("→") { it.name }}→${promotion.name}",
-                    RulesetErrorSeverity.Warning)
+                    RulesetErrorSeverity.Warning, promotion)
                 return
             }
             if (level > 99) return
diff --git a/core/src/com/unciv/models/ruleset/validation/UniqueValidator.kt b/core/src/com/unciv/models/ruleset/validation/UniqueValidator.kt
index aae99ef81c..946754edf6 100644
--- a/core/src/com/unciv/models/ruleset/validation/UniqueValidator.kt
+++ b/core/src/com/unciv/models/ruleset/validation/UniqueValidator.kt
@@ -60,30 +60,29 @@ class UniqueValidator(val ruleset: Ruleset) {
         tryFixUnknownUniques: Boolean,
         uniqueContainer: IHasUniques?,
         reportRulesetSpecificErrors: Boolean
-    ): List<RulesetError> {
-        val prefix by lazy { (if (uniqueContainer is IRulesetObject) "${uniqueContainer.originRuleset}: " else "") +
-            (if (uniqueContainer == null) "The" else "(${uniqueContainer.getUniqueTarget().name}) ${uniqueContainer.name}'s") }
-        if (unique.type == null) return checkUntypedUnique(unique, tryFixUnknownUniques, prefix)
+    ): RulesetErrorList {
+        val prefix by lazy { getUniqueContainerPrefix(uniqueContainer) + "\"${unique.text}\"" }
+        if (unique.type == null) return checkUntypedUnique(unique, tryFixUnknownUniques, uniqueContainer, prefix)
 
-        val rulesetErrors = RulesetErrorList()
+        val rulesetErrors = RulesetErrorList(ruleset)
 
         if (uniqueContainer != null && !unique.type.canAcceptUniqueTarget(uniqueContainer.getUniqueTarget()))
-            rulesetErrors.add(RulesetError("$prefix unique \"${unique.text}\" is not allowed on its target type", RulesetErrorSeverity.Warning))
+            rulesetErrors.add("$prefix is not allowed on its target type", RulesetErrorSeverity.Warning, uniqueContainer)
 
         val typeComplianceErrors = getComplianceErrors(unique)
         for (complianceError in typeComplianceErrors) {
             if (!reportRulesetSpecificErrors && complianceError.errorSeverity == UniqueType.UniqueParameterErrorSeverity.RulesetSpecific)
                 continue
 
-            rulesetErrors.add(RulesetError("$prefix unique \"${unique.text}\" contains parameter ${complianceError.parameterName}," +
+            rulesetErrors.add("$prefix contains parameter ${complianceError.parameterName}," +
                 " which does not fit parameter type" +
                 " ${complianceError.acceptableParameterTypes.joinToString(" or ") { it.parameterName }} !",
-                complianceError.errorSeverity.getRulesetErrorSeverity()
-            ))
+                complianceError.errorSeverity.getRulesetErrorSeverity(), uniqueContainer
+            )
         }
 
         for (conditional in unique.conditionals) {
-            addConditionalErrors(conditional, rulesetErrors, prefix, unique, reportRulesetSpecificErrors)
+            addConditionalErrors(conditional, rulesetErrors, prefix, unique, uniqueContainer, reportRulesetSpecificErrors)
         }
 
         if (unique.type in MapUnitCache.UnitMovementUniques
@@ -91,14 +90,17 @@ class UniqueValidator(val ruleset: Ruleset) {
             )
             // (Stay silent if the only conditional is `<for [All] units>` - as in G&K Denmark)
             // Not necessarily even a problem, but yes something mod maker should be aware of
-            rulesetErrors.add("$prefix unique \"${unique.text}\" contains a conditional on a unit movement unique. " +
+            rulesetErrors.add(
+                "$prefix contains a conditional on a unit movement unique. " +
                 "Due to performance considerations, this unique is cached on the unit," +
-                " and the conditional may not always limit the unique correctly.", RulesetErrorSeverity.OK)
+                " and the conditional may not always limit the unique correctly.",
+                RulesetErrorSeverity.OK, uniqueContainer
+            )
 
         if (reportRulesetSpecificErrors)
         // If we don't filter these messages will be listed twice as this function is called twice on most objects
         // The tests are RulesetInvariant in nature, but RulesetSpecific is called for _all_ objects, invariant is not.
-            addDeprecationAnnotationErrors(unique, prefix, rulesetErrors)
+            addDeprecationAnnotationErrors(unique, prefix, rulesetErrors, uniqueContainer)
 
         return rulesetErrors
     }
@@ -108,40 +110,41 @@ class UniqueValidator(val ruleset: Ruleset) {
         rulesetErrors: RulesetErrorList,
         prefix: String,
         unique: Unique,
+        uniqueContainer: IHasUniques?,
         reportRulesetSpecificErrors: Boolean
     ) {
         if (unique.hasFlag(UniqueFlag.NoConditionals)) {
             rulesetErrors.add(
-                "$prefix unique \"${unique.text}\" contains the conditional \"${conditional.text}\"," +
+                "$prefix contains the conditional \"${conditional.text}\"," +
                     " but the unique does not accept conditionals!",
-                RulesetErrorSeverity.Error
+                RulesetErrorSeverity.Error, uniqueContainer
             )
             return
         }
 
         if (conditional.type == null) {
             rulesetErrors.add(
-                "$prefix unique \"${unique.text}\" contains the conditional \"${conditional.text}\"," +
+                "$prefix contains the conditional \"${conditional.text}\"," +
                     " which is of an unknown type!",
-                RulesetErrorSeverity.Warning
+                RulesetErrorSeverity.Warning, uniqueContainer
             )
             return
         }
 
         if (conditional.type.targetTypes.none { it.modifierType != UniqueTarget.ModifierType.None })
             rulesetErrors.add(
-                "$prefix unique \"${unique.text}\" contains the conditional \"${conditional.text}\"," +
+                "$prefix contains the conditional \"${conditional.text}\"," +
                     " which is a Unique type not allowed as conditional or trigger.",
-                RulesetErrorSeverity.Warning
+                RulesetErrorSeverity.Warning, uniqueContainer
             )
 
         if (conditional.type.targetTypes.contains(UniqueTarget.UnitActionModifier)
             && unique.type!!.targetTypes.none { UniqueTarget.UnitAction.canAcceptUniqueTarget(it) }
         )
             rulesetErrors.add(
-                "$prefix unique \"${unique.text}\" contains the conditional \"${conditional.text}\"," +
+                "$prefix contains the conditional \"${conditional.text}\"," +
                     " which as a UnitActionModifier is only allowed on UnitAction uniques.",
-                RulesetErrorSeverity.Warning
+                RulesetErrorSeverity.Warning, uniqueContainer
             )
 
         val conditionalComplianceErrors =
@@ -152,12 +155,10 @@ class UniqueValidator(val ruleset: Ruleset) {
                 continue
 
             rulesetErrors.add(
-                RulesetError(
-                    "$prefix unique \"${unique.text}\" contains the conditional \"${conditional.text}\"." +
-                        " This contains the parameter ${complianceError.parameterName} which does not fit parameter type" +
-                        " ${complianceError.acceptableParameterTypes.joinToString(" or ") { it.parameterName }} !",
-                    complianceError.errorSeverity.getRulesetErrorSeverity()
-                )
+                "$prefix contains the conditional \"${conditional.text}\"." +
+                " This contains the parameter ${complianceError.parameterName} which does not fit parameter type" +
+                " ${complianceError.acceptableParameterTypes.joinToString(" or ") { it.parameterName }} !",
+                complianceError.errorSeverity.getRulesetErrorSeverity(), uniqueContainer
             )
         }
     }
@@ -165,19 +166,20 @@ class UniqueValidator(val ruleset: Ruleset) {
     private fun addDeprecationAnnotationErrors(
         unique: Unique,
         prefix: String,
-        rulesetErrors: RulesetErrorList
+        rulesetErrors: RulesetErrorList,
+        uniqueContainer: IHasUniques?
     ) {
         val deprecationAnnotation = unique.getDeprecationAnnotation()
         if (deprecationAnnotation != null) {
             val replacementUniqueText = unique.getReplacementText(ruleset)
             val deprecationText =
-                "$prefix unique \"${unique.text}\" is deprecated ${deprecationAnnotation.message}," +
+                "$prefix is deprecated ${deprecationAnnotation.message}," +
                         if (deprecationAnnotation.replaceWith.expression != "") " replace with \"${replacementUniqueText}\"" else ""
             val severity = if (deprecationAnnotation.level == DeprecationLevel.WARNING)
                 RulesetErrorSeverity.WarningOptionsOnly // Not user-visible
             else RulesetErrorSeverity.Warning // User visible
 
-            rulesetErrors.add(deprecationText, severity)
+            rulesetErrors.add(deprecationText, severity, uniqueContainer)
         }
     }
 
@@ -185,7 +187,7 @@ class UniqueValidator(val ruleset: Ruleset) {
     private fun getComplianceErrors(
         unique: Unique,
     ): List<UniqueComplianceError> {
-        if (unique.type==null) return emptyList()
+        if (unique.type == null) return emptyList()
         val errorList = ArrayList<UniqueComplianceError>()
         for ((index, param) in unique.params.withIndex()) {
             val acceptableParamTypes = unique.type.parameterTypeMap[index]
@@ -215,24 +217,26 @@ class UniqueValidator(val ruleset: Ruleset) {
         return severity
     }
 
-    private fun checkUntypedUnique(unique: Unique, tryFixUnknownUniques: Boolean, prefix: String ): List<RulesetError> {
+    private fun checkUntypedUnique(unique: Unique, tryFixUnknownUniques: Boolean, uniqueContainer: IHasUniques?, prefix: String): RulesetErrorList {
         // Malformed conditional is always bad
         if (unique.text.count { it == '<' } != unique.text.count { it == '>' })
-            return listOf(RulesetError(
-                "$prefix unique \"${unique.text}\" contains mismatched conditional braces!",
-                RulesetErrorSeverity.Warning))
+            return RulesetErrorList.of(
+                "$prefix contains mismatched conditional braces!",
+                RulesetErrorSeverity.Warning, ruleset, uniqueContainer
+            )
 
         // Support purely filtering Uniques without actual implementation
-        if (isFilteringUniqueAllowed(unique)) return emptyList()
+        if (isFilteringUniqueAllowed(unique)) return RulesetErrorList()
         if (tryFixUnknownUniques) {
-            val fixes = tryFixUnknownUnique(unique, prefix)
+            val fixes = tryFixUnknownUnique(unique, uniqueContainer, prefix)
             if (fixes.isNotEmpty()) return fixes
         }
 
-        return listOf(RulesetError(
-            "$prefix unique \"${unique.text}\" not found in Unciv's unique types, and is not used as a filtering unique.",
-            if (unique.params.isEmpty()) RulesetErrorSeverity.OK else RulesetErrorSeverity.Warning
-        ))
+        return RulesetErrorList.of(
+            "$prefix not found in Unciv's unique types, and is not used as a filtering unique.",
+            if (unique.params.isEmpty()) RulesetErrorSeverity.OK else RulesetErrorSeverity.Warning,
+            ruleset, uniqueContainer
+        )
     }
 
     private fun isFilteringUniqueAllowed(unique: Unique): Boolean {
@@ -242,7 +246,7 @@ class UniqueValidator(val ruleset: Ruleset) {
         return unique.text in allUniqueParameters // referenced at least once from elsewhere
     }
 
-    private fun tryFixUnknownUnique(unique: Unique, prefix: String): List<RulesetError> {
+    private fun tryFixUnknownUnique(unique: Unique, uniqueContainer: IHasUniques?, prefix: String): RulesetErrorList {
         val similarUniques = UniqueType.values().filter {
             getRelativeTextDistance(
                 it.placeholderText,
@@ -253,13 +257,15 @@ class UniqueValidator(val ruleset: Ruleset) {
             similarUniques.filter { it.placeholderText == unique.placeholderText }
         return when {
             // This should only ever happen if a bug is or has been introduced that prevents Unique.type from being set for a valid UniqueType, I think.\
-            equalUniques.isNotEmpty() -> listOf(RulesetError(
-                "$prefix unique \"${unique.text}\" looks like it should be fine, but for some reason isn't recognized.",
-                RulesetErrorSeverity.OK))
+            equalUniques.isNotEmpty() -> RulesetErrorList.of(
+                "$prefix looks like it should be fine, but for some reason isn't recognized.",
+                RulesetErrorSeverity.OK,
+                ruleset, uniqueContainer
+            )
 
             similarUniques.isNotEmpty() -> {
                 val text =
-                    "$prefix unique \"${unique.text}\" looks like it may be a misspelling of:\n" +
+                    "$prefix looks like it may be a misspelling of:\n" +
                         similarUniques.joinToString("\n") { uniqueType ->
                             var text = "\"${uniqueType.text}"
                             if (unique.conditionals.isNotEmpty())
@@ -268,9 +274,16 @@ class UniqueValidator(val ruleset: Ruleset) {
                             if (uniqueType.getDeprecationAnnotation() != null) text += " (Deprecated)"
                             return@joinToString text
                         }.prependIndent("\t")
-                listOf(RulesetError(text, RulesetErrorSeverity.OK))
+                RulesetErrorList.of(text, RulesetErrorSeverity.OK, ruleset, uniqueContainer)
             }
-            else -> emptyList()
+            else -> RulesetErrorList()
         }
     }
+
+    companion object {
+        internal fun getUniqueContainerPrefix(uniqueContainer: IHasUniques?) =
+            (if (uniqueContainer is IRulesetObject) "${uniqueContainer.originRuleset}: " else "") +
+                (if (uniqueContainer == null) "The" else "(${uniqueContainer.getUniqueTarget().name}) ${uniqueContainer.name}'s") +
+                " unique "
+    }
 }
diff --git a/core/src/com/unciv/ui/popups/options/ModCheckTab.kt b/core/src/com/unciv/ui/popups/options/ModCheckTab.kt
index 45cbe8504f..3bebda5713 100644
--- a/core/src/com/unciv/ui/popups/options/ModCheckTab.kt
+++ b/core/src/com/unciv/ui/popups/options/ModCheckTab.kt
@@ -8,7 +8,6 @@ import com.badlogic.gdx.utils.Align
 import com.unciv.models.ruleset.Ruleset
 import com.unciv.models.ruleset.RulesetCache
 import com.unciv.models.ruleset.unique.Unique
-import com.unciv.models.ruleset.validation.RulesetError
 import com.unciv.models.ruleset.validation.RulesetErrorSeverity
 import com.unciv.models.ruleset.validation.UniqueValidator
 import com.unciv.models.translations.tr
@@ -101,8 +100,8 @@ class ModCheckTab(
                     else RulesetCache.checkCombinedModLinks(linkedSetOf(mod.name), base, tryFixUnknownUniques = true)
                 modLinks.sortByDescending { it.errorSeverityToReport }
                 val noProblem = !modLinks.isNotOK()
-                if (modLinks.isNotEmpty()) modLinks += RulesetError("", RulesetErrorSeverity.OK)
-                if (noProblem) modLinks += RulesetError("No problems found.".tr(), RulesetErrorSeverity.OK)
+                if (modLinks.isNotEmpty()) modLinks.add("", RulesetErrorSeverity.OK, sourceObject = null)
+                if (noProblem) modLinks.add("No problems found.".tr(), RulesetErrorSeverity.OK, sourceObject = null)
 
                 launchOnGLThread {
                     // When the options popup is already closed before this postRunnable is run,
diff --git a/docs/Modders/uniques.md b/docs/Modders/uniques.md
index 793ad8aba1..ea7d23be8e 100644
--- a/docs/Modders/uniques.md
+++ b/docs/Modders/uniques.md
@@ -2170,9 +2170,6 @@ Due to performance considerations, this unique is cached, thus conditionals may
 
 	Applicable to: Conditional
 
-??? example  "&lt;hidden from users&gt;"
-	Applicable to: Conditional
-
 ## TriggerCondition uniques
 !!! note ""
 
@@ -2306,6 +2303,14 @@ Due to performance considerations, this unique is cached, thus conditionals may
 ??? example  "&lt;after which this unit is consumed&gt;"
 	Applicable to: UnitActionModifier
 
+## MetaModifier uniques
+!!! note ""
+
+    Modifiers that can be added to other uniques changing user experience, not their behavior
+
+??? example  "&lt;hidden from users&gt;"
+	Applicable to: MetaModifier
+
 
 *[amount]: This indicates a whole number, possibly with a + or - sign, such as `2`, `+13`, or `-3`.
 *[baseTerrain]: The name of any terrain that is a base terrain according to the json file.