diff --git a/core/src/com/unciv/models/ruleset/Ruleset.kt b/core/src/com/unciv/models/ruleset/Ruleset.kt
index ba4fd2e316..7db7ba711a 100644
--- a/core/src/com/unciv/models/ruleset/Ruleset.kt
+++ b/core/src/com/unciv/models/ruleset/Ruleset.kt
@@ -572,7 +572,7 @@ class Ruleset {
         val vanillaRuleset = RulesetCache.getVanillaRuleset()  // for UnitTypes fallback
 
 
-        if (units.values.none { it.uniques.contains(UniqueType.FoundCity.text) })
+        if (units.values.none { it.hasUnique(UniqueType.FoundCity) })
            lines += "No city-founding units in ruleset!"
 
         for (unit in units.values) {
@@ -879,7 +879,7 @@ object RulesetCache : HashMap<String,Ruleset>() {
             else getVanillaRuleset()
 
 
-        val loadedMods = mods
+        val loadedMods = mods.asSequence()
             .filter { containsKey(it) }
             .map { this[it]!! }
             .filter { !it.modOptions.isBaseRuleset } + 
@@ -887,7 +887,9 @@ object RulesetCache : HashMap<String,Ruleset>() {
 
         for (mod in loadedMods.sortedByDescending { it.modOptions.isBaseRuleset }) {
             if (mod.modOptions.isBaseRuleset) {
-                newRuleset.modOptions = mod.modOptions
+                // This is so we don't keep using the base ruleset's unqiues *by reference* and add to in ad infinitum
+                newRuleset.modOptions.uniques = ArrayList()
+                newRuleset.modOptions.isBaseRuleset = true
             }
             newRuleset.add(mod)
             newRuleset.mods += mod.name