From 34c085a7777b84d61544fe4a615e7837e2c36331 Mon Sep 17 00:00:00 2001
From: Kamron Batman <3953314+kamronbatman@users.noreply.github.com>
Date: Thu, 2 Jul 2026 23:52:58 -0700
Subject: [PATCH] feat: add TailSwipe monster ability and give it to StoneSlith

Port StoneSlith's TailSwipe from ServUO as a proper ModernUO MonsterAbility
(MonsterAbilitySingleTarget, on GiveMeleeDamage, 30s cooldown like ServUO's
SpecialAbility base). On hit it plays the tail-swipe effect and either stuns
(3s paralyze) or confuses (-20 Dex/Int for 5s).

Uses the OSI/Stratics-reported ~90% stun / ~10% confuse split rather than
ServUO's incorrect even 50/50. StoneSlith now runs GraspingClaw + TailSwipe,
closing the last ability gap from the port.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 .../Mobiles/Abilities/MonsterAbilities.cs     |  1 +
 .../Mobiles/Abilities/MonsterAbilityType.cs   |  3 +-
 .../UOContent/Mobiles/Abilities/TailSwipe.cs  | 35 +++++++++++++++++++
 .../Mobiles/Monsters/Reptile/StoneSlith.cs    |  7 ++--
 4 files changed, 41 insertions(+), 5 deletions(-)
 create mode 100644 Projects/UOContent/Mobiles/Abilities/TailSwipe.cs

diff --git a/Projects/UOContent/Mobiles/Abilities/MonsterAbilities.cs b/Projects/UOContent/Mobiles/Abilities/MonsterAbilities.cs
index 652bc5b05..0afdf05de 100644
--- a/Projects/UOContent/Mobiles/Abilities/MonsterAbilities.cs
+++ b/Projects/UOContent/Mobiles/Abilities/MonsterAbilities.cs
@@ -13,6 +13,7 @@ public static class MonsterAbilities
 
     // Resistance Debuffs
     public static GraspingClaw GraspingClaw => new();
+    public static TailSwipe TailSwipe => new();
     public static RuneCorruption RuneCorruption => new();
     public static FanningFire FanningFire => new(0.05, -10, 35, 45);
 
diff --git a/Projects/UOContent/Mobiles/Abilities/MonsterAbilityType.cs b/Projects/UOContent/Mobiles/Abilities/MonsterAbilityType.cs
index 9f188243d..fe0fe46f4 100644
--- a/Projects/UOContent/Mobiles/Abilities/MonsterAbilityType.cs
+++ b/Projects/UOContent/Mobiles/Abilities/MonsterAbilityType.cs
@@ -20,5 +20,6 @@ public enum MonsterAbilityType
     FanningFire, // Fire debuff
     RuneCorruption,
     FanThrow,
-    BloodBath
+    BloodBath,
+    TailSwipe
 }
diff --git a/Projects/UOContent/Mobiles/Abilities/TailSwipe.cs b/Projects/UOContent/Mobiles/Abilities/TailSwipe.cs
new file mode 100644
index 000000000..9982355b2
--- /dev/null
+++ b/Projects/UOContent/Mobiles/Abilities/TailSwipe.cs
@@ -0,0 +1,35 @@
+using System;
+
+namespace Server.Mobiles;
+
+public class TailSwipe : MonsterAbilitySingleTarget
+{
+    public override MonsterAbilityType AbilityType => MonsterAbilityType.TailSwipe;
+    public override MonsterAbilityTrigger AbilityTrigger => MonsterAbilityTrigger.GiveMeleeDamage;
+    public override double ChanceToTrigger => 0.3;
+
+    // ServUO's SpecialAbility base cooldown; TailSwipe does not override it.
+    public override TimeSpan MinTriggerCooldown => TimeSpan.FromSeconds(30);
+    public override TimeSpan MaxTriggerCooldown => TimeSpan.FromSeconds(30);
+
+    protected override void OnTarget(MonsterAbilityTrigger trigger, BaseCreature source, Mobile defender)
+    {
+        source.DoHarmful(defender);
+
+        defender.PlaySound(0x204);
+        defender.FixedEffect(0x376A, 6, 1);
+
+        // OSI/Stratics reports roughly a 90% stun / 10% confuse split (ServUO's even 50/50 is incorrect).
+        if (Utility.RandomDouble() < 0.10)
+        {
+            defender.SendLocalizedMessage(1112555); // You're left confused as the creature's tail catches you right in the face!
+            defender.AddStatMod(new StatMod(StatType.Dex, "[TailSwipe] Dex", -20, TimeSpan.FromSeconds(5.0)));
+            defender.AddStatMod(new StatMod(StatType.Int, "[TailSwipe] Int", -20, TimeSpan.FromSeconds(5.0)));
+        }
+        else
+        {
+            defender.SendLocalizedMessage(1112554); // You're stunned as the creature's tail knocks the wind out of you.
+            defender.Paralyze(TimeSpan.FromSeconds(3.0));
+        }
+    }
+}
diff --git a/Projects/UOContent/Mobiles/Monsters/Reptile/StoneSlith.cs b/Projects/UOContent/Mobiles/Monsters/Reptile/StoneSlith.cs
index 94605c7e2..c7a3d7a45 100644
--- a/Projects/UOContent/Mobiles/Monsters/Reptile/StoneSlith.cs
+++ b/Projects/UOContent/Mobiles/Monsters/Reptile/StoneSlith.cs
@@ -6,7 +6,7 @@ namespace Server.Mobiles;
 [SerializationGenerator(0)]
 public partial class StoneSlith : BaseCreature
 {
-    private static readonly MonsterAbility[] _abilities = [MonsterAbilities.GraspingClaw];
+    private static readonly MonsterAbility[] _abilities = [MonsterAbilities.GraspingClaw, MonsterAbilities.TailSwipe];
 
     [Constructible]
     public StoneSlith() : base(AIType.AI_Melee)
@@ -40,9 +40,8 @@ public partial class StoneSlith : BaseCreature
         MinTameSkill = 65.1;
         ControlSlots = 2;
 
-        // TODO(SA-creatures): unported vs ServUO — SpecialAbility.TailSwipe (no ModernUO equivalent),
-        // DragonBlood carving, and the minor drops SlithEye / TatteredAncientScroll / AncientPotteryFragments
-        // (item classes not yet in ModernUO).
+        // TODO(SA-creatures): unported vs ServUO — DragonBlood carving, and the minor drops
+        // SlithEye / TatteredAncientScroll / AncientPotteryFragments (item classes not yet in ModernUO).
     }
 
     public override string CorpseName => "a slith corpse";