diff --git a/paper-server/patches/sources/net/minecraft/world/entity/boss/wither/WitherBoss.java.patch b/paper-server/patches/sources/net/minecraft/world/entity/boss/wither/WitherBoss.java.patch
index bf9b1fb3ae..67144bc046 100644
--- a/paper-server/patches/sources/net/minecraft/world/entity/boss/wither/WitherBoss.java.patch
+++ b/paper-server/patches/sources/net/minecraft/world/entity/boss/wither/WitherBoss.java.patch
@@ -148,7 +148,7 @@
          } else {
              this.noActionTime = 0;
          }
-@@ -549,7 +596,7 @@
+@@ -549,12 +596,12 @@
  
      @Override
      public boolean canUsePortal(boolean allowVehicles) {
@@ -157,3 +157,9 @@
      }
  
      @Override
+     public boolean canBeAffected(MobEffectInstance effect) {
+-        return effect.is(MobEffects.WITHER) ? false : super.canBeAffected(effect);
++        return effect.is(MobEffects.WITHER) && this.level().paperConfig().entities.mobEffects.immuneToWitherEffect.wither ? false : super.canBeAffected(effect); // Paper - Add config for mobs immune to default effects
+     }
+ 
+     private class WitherDoNothingGoal extends Goal {
diff --git a/paper-server/patches/sources/net/minecraft/world/entity/monster/Spider.java.patch b/paper-server/patches/sources/net/minecraft/world/entity/monster/Spider.java.patch
index c4a7c3e124..1dae9b0f57 100644
--- a/paper-server/patches/sources/net/minecraft/world/entity/monster/Spider.java.patch
+++ b/paper-server/patches/sources/net/minecraft/world/entity/monster/Spider.java.patch
@@ -9,6 +9,15 @@
          }
  
      }
+@@ -126,7 +126,7 @@
+ 
+     @Override
+     public boolean canBeAffected(MobEffectInstance effect) {
+-        return effect.is(MobEffects.POISON) ? false : super.canBeAffected(effect);
++        return effect.is(MobEffects.POISON) && this.level().paperConfig().entities.mobEffects.spidersImmuneToPoisonEffect ? false : super.canBeAffected(effect); // Paper - Add config for mobs immune to default effects
+     }
+ 
+     public boolean isClimbing() {
 @@ -172,7 +172,7 @@
              Holder<MobEffect> holder = entityspider_groupdataspider.effect;
  
diff --git a/paper-server/patches/sources/net/minecraft/world/entity/monster/WitherSkeleton.java.patch b/paper-server/patches/sources/net/minecraft/world/entity/monster/WitherSkeleton.java.patch
index 8ebfeaa886..61b7e05667 100644
--- a/paper-server/patches/sources/net/minecraft/world/entity/monster/WitherSkeleton.java.patch
+++ b/paper-server/patches/sources/net/minecraft/world/entity/monster/WitherSkeleton.java.patch
@@ -9,3 +9,11 @@
              }
  
              return true;
+@@ -127,6 +127,6 @@
+ 
+     @Override
+     public boolean canBeAffected(MobEffectInstance effect) {
+-        return effect.is(MobEffects.WITHER) ? false : super.canBeAffected(effect);
++        return effect.is(MobEffects.WITHER) && this.level().paperConfig().entities.mobEffects.immuneToWitherEffect.witherSkeleton ? false : super.canBeAffected(effect); // Paper - Add config for mobs immune to default effects
+     }
+ }