diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecomobs/category/spawning/impl/SpawnMethodFactoryReplace.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecomobs/category/spawning/impl/SpawnMethodFactoryReplace.kt
index bcbcf8c..1b86ed4 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecomobs/category/spawning/impl/SpawnMethodFactoryReplace.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecomobs/category/spawning/impl/SpawnMethodFactoryReplace.kt
@@ -2,6 +2,7 @@ package com.willfp.ecomobs.category.spawning.impl
 
 import com.willfp.eco.core.config.interfaces.Config
 import com.willfp.eco.core.entities.Entities
+import com.willfp.eco.util.randDouble
 import com.willfp.ecomobs.EcoMobsPlugin
 import com.willfp.ecomobs.category.MobCategory
 import com.willfp.ecomobs.category.spawning.SpawnMethod
@@ -57,6 +58,10 @@ object SpawnMethodFactoryReplace : SpawnMethodFactory("replace") {
                 return
             }
 
+            if (randDouble(0.0, 100.0) > config.getDouble("chance")) {
+                return
+            }
+
             val mob = category.mobs.randomOrNull() ?: return
 
 
diff --git a/eco-core/core-plugin/src/main/resources/categories/_example.yml b/eco-core/core-plugin/src/main/resources/categories/_example.yml
index 2b37bff..f13c6c3 100644
--- a/eco-core/core-plugin/src/main/resources/categories/_example.yml
+++ b/eco-core/core-plugin/src/main/resources/categories/_example.yml
@@ -26,6 +26,9 @@ spawning:
       - zombie
       - skeleton
 
+    # The chance for the mob to override, as a percentage
+    chance: 100
+
 
   # Options for custom spawning
   custom: