diff --git a/HouseRules.Essentials/AbilityTargetEffectsOverriddenRule.cs b/HouseRules.Essentials/AbilityTargetEffectsOverriddenRule.cs
new file mode 100644
index 00000000..c90c062c
--- /dev/null
+++ b/HouseRules.Essentials/AbilityTargetEffectsOverriddenRule.cs
@@ -0,0 +1,56 @@
+namespace HouseRules.Essentials.Rules
+{
+    using System.Collections.Generic;
+    using System.Linq;
+    using DataKeys;
+    using HouseRules.Core.Types;
+
+    public sealed class AbilityTargetEffectsOverriddenRule : Rule, IConfigWritable<Dictionary<AbilityKey, List<EffectStateType>>>, IMultiplayerSafe
+    {
+        public override string Description => "Some abilities have added secondary effects.";
+
+        private readonly Dictionary<AbilityKey, List<EffectStateType>> _adjustments;
+        private Dictionary<AbilityKey, List<EffectStateType>> _originals;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AbilityTargetEffectsOverriddenRule"/> class.
+        /// </summary>
+        /// <param name="adjustments">Key-value pairs of abilityKey and List<EffectStateType>.</param>
+        public AbilityTargetEffectsOverriddenRule(Dictionary<AbilityKey, List<EffectStateType>> adjustments)
+        {
+            _adjustments = adjustments;
+            _originals = new Dictionary<AbilityKey, List<EffectStateType>>();
+        }
+
+        public Dictionary<AbilityKey, List<EffectStateType>> GetConfigObject() => _adjustments;
+
+        protected override void OnPreGameCreated(Context context)
+        {
+            _originals = ReplaceAbilities(context, _adjustments);
+        }
+
+        protected override void OnDeactivate(Context context)
+        {
+            ReplaceAbilities(context, _originals);
+        }
+
+        private static Dictionary<AbilityKey, List<EffectStateType>> ReplaceAbilities(Context context, Dictionary<AbilityKey, List<EffectStateType>> replacements)
+        {
+            var originals = new Dictionary<AbilityKey, List<EffectStateType>>();
+            foreach (var replacement in replacements)
+            {
+                var abilityPromise = context.AbilityFactory.LoadAbility(replacement.Key);
+                abilityPromise.OnLoaded(ability =>
+                {
+                    originals[replacement.Key] = ability.targetEffects.ToList();
+                    ability.targetEffects = replacement.Value.ToArray();
+                });
+            }
+
+            // Theoretically, there can be a race condition as there's no guarantee the promise above is fulfilled by
+            // the return value is used. Realistically, there's no concern since the value isn't used until after the
+            // promise has long been fulfilled.
+            return originals;
+        }
+    }
+}
diff --git a/HouseRules.Essentials/HouseRulesEssentialsBase.cs b/HouseRules.Essentials/HouseRulesEssentialsBase.cs
index b88dce9e..87b38cfb 100644
--- a/HouseRules.Essentials/HouseRulesEssentialsBase.cs
+++ b/HouseRules.Essentials/HouseRulesEssentialsBase.cs
@@ -60,6 +60,7 @@ private static void RegisterRuleTypes()
             HR.Rulebook.Register(typeof(AbilityActionCostAdjustedRule));
             HR.Rulebook.Register(typeof(AbilityRandomPieceListRule));
             HR.Rulebook.Register(typeof(AbilityStealthDamageOverriddenRule));
+            HR.Rulebook.Register(typeof(AbilityTargetEffectsOverriddenRule));
             HR.Rulebook.Register(typeof(ApplyEffectOnHitAdjustedRule));
             HR.Rulebook.Register(typeof(BackstabConfigOverriddenRule));
             HR.Rulebook.Register(typeof(CourageShantyAddsHpRule));
diff --git a/HouseRules.Essentials/README.md b/HouseRules.Essentials/README.md
index 56518225..e5a27ac2 100644
--- a/HouseRules.Essentials/README.md
+++ b/HouseRules.Essentials/README.md
@@ -189,6 +189,23 @@ The [Settings Reference](../docs/SettingsReference.md) contains lists of all dif
   },
   ```
 
+  #### __AbilityTargetEffectsAdjusted__: Replaces the list of addition effects to the selected abilities
+  - REPLACES the list of addition effects for the selected abilities. You may manually include the original effect if desired.
+  - To configure:
+    - Specify the [AbilityKey](../docs/SettingsReference.md#abilitykeys) of the ability to modify.
+    - Specify the list of [EffectStates](../docs/SettingsReference.md#effectstatetypes) that the ability should apply.
+
+  ###### _Example JSON config for AbilityTargetEffectsAdjusted_
+
+  ```json
+  {
+    "Rule": "AbilityTargetEffectsAdjusted",
+    "Config": {
+      "Javelin": [ "Weaken1Turn" ],
+      "WarCry": [ "Panic", "Blinded" ]
+  }
+  ```
+
 #### __ApplyEffectOnHitAdjusted__: Adjusts the effect that a ♟️BoardPiece has on attackers.
   - For example, you can make Barricades inspire Panic on enemies that hit it.
   - To be useful the effect has to last at least 2 rounds.