diff --git a/core/src/com/unciv/logic/automation/NextTurnAutomation.kt b/core/src/com/unciv/logic/automation/NextTurnAutomation.kt
index 6354aa1510..4888e4a54d 100644
--- a/core/src/com/unciv/logic/automation/NextTurnAutomation.kt
+++ b/core/src/com/unciv/logic/automation/NextTurnAutomation.kt
@@ -618,8 +618,8 @@ object NextTurnAutomation {
         for (unit in civInfo.getCivUnits()) {
             if (unit.promotions.canBePromoted()) {
                 val availablePromotions = unit.promotions.getAvailablePromotions()
-                if (availablePromotions.isNotEmpty())
-                    unit.promotions.addPromotion(availablePromotions.random().name)
+                if (availablePromotions.any())
+                    unit.promotions.addPromotion(availablePromotions.toList().random().name)
             }
 
             when {
diff --git a/core/src/com/unciv/logic/map/UnitPromotions.kt b/core/src/com/unciv/logic/map/UnitPromotions.kt
index b848abfd0e..fda1bdc12a 100644
--- a/core/src/com/unciv/logic/map/UnitPromotions.kt
+++ b/core/src/com/unciv/logic/map/UnitPromotions.kt
@@ -2,6 +2,7 @@ package com.unciv.logic.map
 
 import com.unciv.models.ruleset.UniqueTriggerActivation
 import com.unciv.models.ruleset.unit.Promotion
+import com.unciv.models.translations.equalsPlaceholderText
 
 class UnitPromotions {
     // Having this as mandatory constructor parameter would be safer, but this class is part of a
@@ -27,7 +28,7 @@ class UnitPromotions {
     fun xpForNextPromotion() = (numberOfPromotions+1)*10
     fun canBePromoted(): Boolean {
         if (XP < xpForNextPromotion()) return false
-        if (getAvailablePromotions().isEmpty()) return false
+        if (getAvailablePromotions().none()) return false
         return true
     }
 
@@ -57,10 +58,17 @@ class UnitPromotions {
         }
     }
 
-    fun getAvailablePromotions(): List<Promotion> {
+    fun getAvailablePromotions(): Sequence<Promotion> {
         return unit.civInfo.gameInfo.ruleSet.unitPromotions.values
-                .filter { unit.type.name in it.unitTypes && it.name !in promotions }
-                .filter { it.prerequisites.isEmpty() || it.prerequisites.any { p->p in promotions } }
+            .asSequence()
+            .filter { unit.type.name in it.unitTypes && it.name !in promotions }
+            .filter { it.prerequisites.isEmpty() || it.prerequisites.any { p->p in promotions } }
+            .filter { 
+                it.uniqueObjects.none { 
+                    unique -> unique.placeholderText == "Incompatible with []" 
+                    && promotions.any { chosenPromotions -> chosenPromotions == unique.params[0] } 
+                }
+            }
     }
 
     fun clone(): UnitPromotions {
diff --git a/core/src/com/unciv/models/ruleset/unit/Promotion.kt b/core/src/com/unciv/models/ruleset/unit/Promotion.kt
index 8c97f8b62c..396ec44e29 100644
--- a/core/src/com/unciv/models/ruleset/unit/Promotion.kt
+++ b/core/src/com/unciv/models/ruleset/unit/Promotion.kt
@@ -12,7 +12,9 @@ import com.unciv.ui.civilopedia.ICivilopediaText
 class Promotion : INamed, ICivilopediaText, IHasUniques {
     override lateinit var name: String
     var prerequisites = listOf<String>()
-    var effect = ""
+    // effect deprecated since 3.16.12, use uniques instead
+        var effect = ""
+    //
     var unitTypes = listOf<String>() // The json parser wouldn't agree to deserialize this as a list of UnitTypes. =(
 
     override var uniques = ArrayList<String>()