diff --git a/core/src/com/unciv/models/ruleset/unique/Unique.kt b/core/src/com/unciv/models/ruleset/unique/Unique.kt
index a8576e40f7..ed78c0ed2e 100644
--- a/core/src/com/unciv/models/ruleset/unique/Unique.kt
+++ b/core/src/com/unciv/models/ruleset/unique/Unique.kt
@@ -318,6 +318,8 @@ class Unique(val text: String, val sourceObjectType: UniqueTarget? = null, val s
                 relevantTile?.matchesFilter(condition.params[0], state.civInfo) == true
             UniqueType.ConditionalInTilesNot ->
                 relevantTile?.matchesFilter(condition.params[0], state.civInfo) == false
+            UniqueType.ConditionalAdjacentTo -> relevantTile?.isAdjacentTo(condition.params[0]) == true
+            UniqueType.ConditionalNotAdjacentTo -> relevantTile?.isAdjacentTo(condition.params[0]) == false
             UniqueType.ConditionalFightingInTiles ->
                 state.attackedTile?.matchesFilter(condition.params[0], state.civInfo) == true
             UniqueType.ConditionalInTilesAnd ->
diff --git a/core/src/com/unciv/models/ruleset/unique/UniqueType.kt b/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
index f380258545..d1908cc766 100644
--- a/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
+++ b/core/src/com/unciv/models/ruleset/unique/UniqueType.kt
@@ -344,7 +344,7 @@ enum class UniqueType(
     Strength("[relativeAmount]% Strength", UniqueTarget.Unit, UniqueTarget.Global),
     StrengthNearCapital("[relativeAmount]% Strength decreasing with distance from the capital", UniqueTarget.Unit, UniqueTarget.Global),
     FlankAttackBonus("[relativeAmount]% to Flank Attack bonuses", UniqueTarget.Unit, UniqueTarget.Global),
-    // There's currently no conditional that would allow you strength vs city-state *cities* and that's why this isn't deprecated yet
+    @Deprecated("as of 4.9.0",ReplaceWith("[+30%]% Strength <vs []>"), DeprecationLevel.ERROR)
     StrengthBonusVsCityStates("+30% Strength when fighting City-State units and cities", UniqueTarget.Global),
     StrengthForAdjacentEnemies("[relativeAmount]% Strength for enemy [combatantFilter] units in adjacent [tileFilter] tiles", UniqueTarget.Unit),
     StrengthWhenStacked("[relativeAmount]% Strength when stacked with [mapUnitFilter]", UniqueTarget.Unit),  // candidate for conditional!
@@ -682,7 +682,8 @@ enum class UniqueType(
     @Deprecated("as of 4.10.3", ReplaceWith("in [{tileFilter} {tileFilter}] tiles"))
     ConditionalInTilesAnd("in [tileFilter] [tileFilter] tiles", UniqueTarget.Conditional),
     ConditionalInTilesNot("in tiles without [tileFilter]", UniqueTarget.Conditional),
-    // TODO: Add adjacency ("in tiles adjacent to [tileFilter]", "in tiles not adjacent to [tileFilter])
+    ConditionalAdjacentTo("in tiles adjacent to [tileFilter]", UniqueTarget.Conditional),
+    ConditionalNotAdjacentTo("in tiles not adjacent to [tileFilter]", UniqueTarget.Conditional),
     ConditionalNearTiles("within [amount] tiles of a [tileFilter]", UniqueTarget.Conditional),
 
     /////// area conditionals
diff --git a/docs/Modders/Unique-parameters.md b/docs/Modders/Unique-parameters.md
index e89d671d3a..06ed843f32 100644
--- a/docs/Modders/Unique-parameters.md
+++ b/docs/Modders/Unique-parameters.md
@@ -148,6 +148,12 @@ A filter determining a part of the population of a city. It can be any of the fo
 - `Unemployed`
 - `Followers of the Majority Religion` or `Followers of this Religion`, both of which only apply when this religion is the majority religion in that city
 
+## combatantFilter
+
+Can be any of:
+- [mapUnitFilter](#mapunitfilter), for unit combatants
+- "City", "All", or [civFilter](#civfilter), for city combatants
+
 ## regionType
 
 Used for dividing the world into regions in each of which a single player is placed at the start of the game.