diff --git a/Projects/UOContent.Tests/Tests/Items/Weapons/ExtendedWeaponAttributesTests.cs b/Projects/UOContent.Tests/Tests/Items/Weapons/ExtendedWeaponAttributesTests.cs
index 0e1cf0b5d..7427cf3a3 100644
--- a/Projects/UOContent.Tests/Tests/Items/Weapons/ExtendedWeaponAttributesTests.cs
+++ b/Projects/UOContent.Tests/Tests/Items/Weapons/ExtendedWeaponAttributesTests.cs
@@ -26,6 +26,7 @@ public class ExtendedWeaponAttributesTests
         Assert.Equal(0x00000002, (int)ExtendedWeaponAttribute.BattleLust);
         Assert.Equal(0x00000004, (int)ExtendedWeaponAttribute.HitSparks);
         Assert.Equal(0x00000008, (int)ExtendedWeaponAttribute.BloodDrinker);
+        Assert.Equal(0x00000010, (int)ExtendedWeaponAttribute.HitSwarm);
     }
 
     [Fact]
@@ -41,6 +42,7 @@ public class ExtendedWeaponAttributesTests
             Assert.Equal(0, weapon.ExtendedWeaponAttributes.BattleLust);
             Assert.Equal(0, weapon.ExtendedWeaponAttributes.HitSparks);
             Assert.Equal(0, weapon.ExtendedWeaponAttributes.BloodDrinker);
+            Assert.Equal(0, weapon.ExtendedWeaponAttributes.HitSwarm);
         }
         finally
         {
@@ -76,6 +78,7 @@ public class ExtendedWeaponAttributesTests
         AssertStaffCommandProperty(nameof(ExtendedWeaponAttributes.BattleLust));
         AssertStaffCommandProperty(nameof(ExtendedWeaponAttributes.HitSparks));
         AssertStaffCommandProperty(nameof(ExtendedWeaponAttributes.BloodDrinker));
+        AssertStaffCommandProperty(nameof(ExtendedWeaponAttributes.HitSwarm));
     }
 
     [Fact]
@@ -92,6 +95,7 @@ public class ExtendedWeaponAttributesTests
             weapon.ExtendedWeaponAttributes.BattleLust = 1;
             weapon.ExtendedWeaponAttributes.HitSparks = 20;
             weapon.ExtendedWeaponAttributes.BloodDrinker = 1;
+            weapon.ExtendedWeaponAttributes.HitSwarm = 30;
 
             var writer = new BufferWriter(true);
             weapon.Serialize(writer);
@@ -106,6 +110,7 @@ public class ExtendedWeaponAttributesTests
             Assert.Equal(1, deserialized.ExtendedWeaponAttributes.BattleLust);
             Assert.Equal(20, deserialized.ExtendedWeaponAttributes.HitSparks);
             Assert.Equal(1, deserialized.ExtendedWeaponAttributes.BloodDrinker);
+            Assert.Equal(30, deserialized.ExtendedWeaponAttributes.HitSwarm);
         }
         finally
         {
diff --git a/Projects/UOContent.Tests/Tests/Items/Weapons/SwarmPropertyTests.cs b/Projects/UOContent.Tests/Tests/Items/Weapons/SwarmPropertyTests.cs
new file mode 100644
index 000000000..3c54fce3f
--- /dev/null
+++ b/Projects/UOContent.Tests/Tests/Items/Weapons/SwarmPropertyTests.cs
@@ -0,0 +1,558 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Server;
+using Server.Items;
+using Server.Mobiles;
+using Server.Spells;
+using Server.Spells.Bushido;
+using Server.Spells.Ninjitsu;
+using Server.Text;
+using Xunit;
+
+namespace UOContent.Tests;
+
+[Collection("Sequential UOContent Tests")]
+public class SwarmPropertyTests
+{
+    private const int SwarmCliloc = 1157325;
+    private static readonly Point3D TestLocation = new(6200, 520, 0);
+
+    [Fact]
+    public void ExtendedWeaponAttributes_StoresAndDupesSwarm()
+    {
+        var weapon = new TestKatana();
+        var dupe = new TestKatana();
+
+        try
+        {
+            weapon.ExtendedWeaponAttributes.HitSwarm = 30;
+
+            weapon.Dupe(dupe);
+
+            Assert.Equal(30, weapon.ExtendedWeaponAttributes.HitSwarm);
+            Assert.Equal(30, dupe.ExtendedWeaponAttributes.HitSwarm);
+        }
+        finally
+        {
+            weapon.Delete();
+            dupe.Delete();
+        }
+    }
+
+    [Fact]
+    public void ExtendedWeaponAttributes_GetProperties_GatesSwarmTooltipToTimeOfLegends()
+    {
+        var previousExpansion = Core.Expansion;
+        var weapon = new TestKatana();
+
+        try
+        {
+            weapon.ExtendedWeaponAttributes.HitSwarm = 30;
+
+            Core.Expansion = Expansion.HS;
+            var preTimeOfLegends = new RecordingPropertyList();
+            weapon.ExtendedWeaponAttributes.GetProperties(preTimeOfLegends);
+            Assert.DoesNotContain(preTimeOfLegends.Entries, entry => entry.Number == SwarmCliloc);
+
+            Core.Expansion = Expansion.TOL;
+            var timeOfLegends = new RecordingPropertyList();
+            weapon.ExtendedWeaponAttributes.GetProperties(timeOfLegends);
+            Assert.Contains(
+                timeOfLegends.Entries,
+                entry => entry.Number == SwarmCliloc && entry.Argument == "30"
+            );
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            weapon.Delete();
+        }
+    }
+
+    [Fact]
+    public void OnHit_PreTimeOfLegends_DoesNotStartSwarmContext()
+    {
+        var previousExpansion = Core.Expansion;
+        var weapon = new TestKatana();
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.HS;
+            weapon.ExtendedWeaponAttributes.HitSwarm = 100;
+
+            weapon.OnHit(attacker, defender);
+
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(0, Swarm.ActiveContextCount);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            weapon.Delete();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void OnHit_NormalSuccessfulHit_StartsOneSwarmContextAndRejectsDuplicateDefenderProc()
+    {
+        var previousExpansion = Core.Expansion;
+        var weapon = new TestKatana();
+        var attacker = CreateMobile();
+        var secondAttacker = CreateMobile(location: new Point3D(6199, 520, 0));
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            weapon.ExtendedWeaponAttributes.HitSwarm = 100;
+
+            weapon.OnHit(attacker, defender);
+
+            Assert.True(Swarm.HasActiveContext(attacker, defender));
+            Assert.True(Swarm.HasActiveContext(defender));
+            Assert.Equal(1, Swarm.ActiveContextCount);
+            Assert.Equal(Swarm.TickCount, Swarm.GetTicksRemainingForTests(attacker, defender));
+
+            Swarm.TryProcOnNormalHit(secondAttacker, defender, 100);
+
+            Assert.True(Swarm.HasActiveContext(attacker, defender));
+            Assert.False(Swarm.HasActiveContext(secondAttacker, defender));
+            Assert.Equal(1, Swarm.ActiveContextCount);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            weapon.Delete();
+            attacker.Delete();
+            secondAttacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void OnHit_CurrentWeaponAbility_DoesNotStartSwarmContext()
+    {
+        var previousExpansion = Core.Expansion;
+        var weapon = new TestKatana();
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            weapon.ExtendedWeaponAttributes.HitSwarm = 100;
+            WeaponAbility.Table[attacker] = new TestWeaponAbility();
+
+            weapon.OnHit(attacker, defender);
+
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            WeaponAbility.Table.Remove(attacker);
+            Swarm.ClearAll();
+            weapon.Delete();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Theory]
+    [InlineData(typeof(TestSpecialMove))]
+    [InlineData(typeof(LightningStrike))]
+    [InlineData(typeof(DeathStrike))]
+    public void OnHit_SpecialMoves_DoNotStartSwarmContext(Type moveType)
+    {
+        var previousExpansion = Core.Expansion;
+        var weapon = new TestKatana();
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            weapon.ExtendedWeaponAttributes.HitSwarm = 100;
+            SpecialMove.Table[attacker] = (SpecialMove)Activator.CreateInstance(moveType);
+
+            weapon.OnHit(attacker, defender);
+
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            SpecialMove.Table.Remove(attacker);
+            Swarm.ClearAll();
+            weapon.Delete();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void ApplySwarmTick_UsesPhysicalResistanceAndReturnsAppliedDamage()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(hitsMax: 200, hits: 200, location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            AddResistance(defender, ResistanceType.Physical, 70);
+
+            var damageApplied = Swarm.ApplySwarmTick(attacker, defender, Swarm.RawDamage);
+
+            Assert.Equal(3, damageApplied);
+            Assert.Equal(197, defender.Hits);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void SwarmContext_TicksThreeTimesAtFiveSecondIntervalAndThenCleansUp()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(hitsMax: 200, hits: 200, location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+
+            Swarm.TryProcOnNormalHit(attacker, defender, 100);
+
+            Assert.True(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(TimeSpan.FromSeconds(5.0), Swarm.TickInterval);
+            Assert.Equal(TimeSpan.FromSeconds(15.0), Swarm.EffectDuration);
+
+            for (var i = 0; i < Swarm.TickCount; i++)
+            {
+                Assert.True(Swarm.TickForTests(attacker, defender));
+            }
+
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(170, defender.Hits);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void PositivePostResistFireDamageClearsSwarmContext()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            Swarm.TryProcOnNormalHit(attacker, defender, 100);
+
+            AOS.Damage(defender, attacker, 10, false, 0, 100, 0, 0, 0);
+
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(0, Swarm.ActiveContextCount);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void FullyResistedFireDamageDoesNotClearSwarmContext()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            AddResistance(defender, ResistanceType.Fire, 100);
+            Swarm.TryProcOnNormalHit(attacker, defender, 100);
+
+            AOS.Damage(defender, attacker, 10, false, 0, 100, 0, 0, 0);
+
+            Assert.True(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(1, Swarm.ActiveContextCount);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void BurningTorchEquipClearsSwarmContextImmediately()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+        var torch = new Torch();
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            Swarm.TryProcOnNormalHit(attacker, defender, 100);
+            torch.Burning = true;
+
+            Assert.True(defender.EquipItem(torch));
+
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(0, Swarm.ActiveContextCount);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            torch.Delete();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void BurningTorchIgniteClearsSwarmContextImmediately()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+        var torch = new Torch();
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            Swarm.TryProcOnNormalHit(attacker, defender, 100);
+            Assert.True(defender.EquipItem(torch));
+
+            torch.Ignite();
+
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(0, Swarm.ActiveContextCount);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            torch.Delete();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void SwarmTickWithBurningTorchClearsContextWithoutDamage()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+        var torch = new Torch();
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+            Assert.True(defender.EquipItem(torch));
+            Swarm.TryProcOnNormalHit(attacker, defender, 100);
+            torch.Burning = true;
+
+            var damageApplied = Swarm.ApplySwarmTick(attacker, defender, Swarm.RawDamage);
+
+            Assert.Equal(0, damageApplied);
+            Assert.Equal(200, defender.Hits);
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            torch.Delete();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void SwarmContext_TickCleansUpInternalizedCombatant()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+
+            Swarm.TryProcOnNormalHit(attacker, defender, 100);
+            defender.Internalize();
+
+            Assert.True(Swarm.TickForTests(attacker, defender));
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(0, Swarm.ActiveContextCount);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void SwarmClear_RemovesContextsForDeletedOrDeadEventMobile()
+    {
+        var previousExpansion = Core.Expansion;
+        var attacker = CreateMobile();
+        var defender = CreateMobile(location: new Point3D(6201, 520, 0));
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+
+            Swarm.TryProcOnNormalHit(attacker, defender, 100);
+            Swarm.Clear(defender);
+
+            Assert.False(Swarm.HasActiveContext(attacker, defender));
+            Assert.Equal(0, Swarm.ActiveContextCount);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            Swarm.ClearAll();
+            attacker.Delete();
+            defender.Delete();
+        }
+    }
+
+    [Fact]
+    public void RunicAttributeGeneration_DoesNotRollSwarm()
+    {
+        var previousExpansion = Core.Expansion;
+        var weapon = new TestKatana();
+
+        try
+        {
+            Core.Expansion = Expansion.TOL;
+
+            BaseRunicTool.ApplyAttributesTo(weapon, false, 0, 25, 100, 100);
+
+            Assert.Equal(0, weapon.ExtendedWeaponAttributes.HitSwarm);
+        }
+        finally
+        {
+            Core.Expansion = previousExpansion;
+            weapon.Delete();
+        }
+    }
+
+    private static Mobile CreateMobile(
+        int hitsMax = 200,
+        int hits = 200,
+        int manaMax = 100,
+        int mana = 0,
+        Point3D location = default
+    )
+    {
+        var mobile = new Mobile(World.NewMobile);
+
+        mobile.DefaultMobileInit();
+        mobile.RawStr = Math.Max(1, (hitsMax - 50) * 2);
+        mobile.RawInt = manaMax;
+        Assert.Equal(hitsMax, mobile.HitsMax);
+        Assert.Equal(manaMax, mobile.ManaMax);
+        mobile.Hits = hits;
+        mobile.Mana = mana;
+        mobile.MoveToWorld(location == default ? TestLocation : location, Map.Felucca);
+        return mobile;
+    }
+
+    private static void AddResistance(Mobile mobile, ResistanceType type, int offset) =>
+        mobile.AddResistanceMod(new ResistanceMod(type, $"SwarmTest{type}{mobile.Serial}", offset, mobile));
+
+    private class TestKatana : Katana
+    {
+        public override bool CheckHit(Mobile attacker, Mobile defender) => true;
+        public override int ComputeDamage(Mobile attacker, Mobile defender) => 1;
+        public override int AbsorbDamage(Mobile attacker, Mobile defender, int damage) => damage;
+        public override void AddBlood(Mobile attacker, Mobile defender, int damage)
+        {
+        }
+    }
+
+    private class TestWeaponAbility : WeaponAbility
+    {
+    }
+
+    private class TestSpecialMove : SpecialMove
+    {
+    }
+
+    private sealed class RecordingPropertyList : IPropertyList
+    {
+        private string _interpolated = string.Empty;
+
+        public List<(int Number, string Argument)> Entries { get; } = [];
+
+        public void Reset()
+        {
+        }
+
+        public void Terminate()
+        {
+        }
+
+        public void Add(int number) => Entries.Add((number, null));
+        public void Add(int number, string argument) => Entries.Add((number, argument));
+        public void Add(ReadOnlySpan<char> argument) => Entries.Add((0, argument.ToString()));
+        public void Add(int number, ReadOnlySpan<char> argument) => Entries.Add((number, argument.ToString()));
+        public void AddChunked(ReadOnlySpan<char> text) => Entries.Add((0, text.ToString()));
+        public OplTextBlock TextBlock() => new(this);
+        public void Add(int number, int value) => Entries.Add((number, value.ToString(CultureInfo.InvariantCulture)));
+        public void AddLocalized(int value) => Entries.Add((0, value.ToString(CultureInfo.InvariantCulture)));
+        public void AddLocalized(int number, int value) => Entries.Add((number, value.ToString(CultureInfo.InvariantCulture)));
+        public void Add(ref IPropertyList.InterpolatedStringHandler handler) => Entries.Add((0, _interpolated));
+        public void Add(int number, ref IPropertyList.InterpolatedStringHandler handler) => Entries.Add((number, _interpolated));
+        public void InitializeInterpolation(int literalLength, int formattedCount) => _interpolated = string.Empty;
+        public void AppendLiteral(string value) => _interpolated += value;
+        public void AppendFormatted<T>(T value) => _interpolated += value;
+        public void AppendFormatted<T>(T value, string format) =>
+            _interpolated += value is IFormattable formattable ? formattable.ToString(format, null) : value;
+        public void AppendFormatted<T>(T value, int alignment) => _interpolated += value;
+        public void AppendFormatted<T>(T value, int alignment, string format) =>
+            _interpolated += value is IFormattable formattable ? formattable.ToString(format, null) : value;
+        public void AppendFormatted(ReadOnlySpan<char> value) => _interpolated += value.ToString();
+        public void AppendFormatted(ReadOnlySpan<char> value, int alignment, string format = null) =>
+            _interpolated += value.ToString();
+        public void AppendFormatted(object value, int alignment = 0, string format = null) => _interpolated += value;
+        public void AppendFormatted(string value) => _interpolated += value;
+        public void AppendFormatted(string value, int alignment, string format = null) => _interpolated += value;
+    }
+}
diff --git a/Projects/UOContent/Items/Lights/Torch.cs b/Projects/UOContent/Items/Lights/Torch.cs
index a2f527070..e596cbe77 100644
--- a/Projects/UOContent/Items/Lights/Torch.cs
+++ b/Projects/UOContent/Items/Lights/Torch.cs
@@ -32,6 +32,7 @@ public partial class Torch : BaseEquipableLight
         if (parent is Mobile mobile && Burning)
         {
             MeerMage.StopEffect(mobile, true);
+            Swarm.ClearDefender(mobile);
         }
     }
 
@@ -42,6 +43,7 @@ public partial class Torch : BaseEquipableLight
         if (Parent is Mobile mobile && Burning)
         {
             MeerMage.StopEffect(mobile, true);
+            Swarm.ClearDefender(mobile);
         }
     }
 }
diff --git a/Projects/UOContent/Items/Weapons/BaseWeapon.cs b/Projects/UOContent/Items/Weapons/BaseWeapon.cs
index 62842762f..5170a7550 100644
--- a/Projects/UOContent/Items/Weapons/BaseWeapon.cs
+++ b/Projects/UOContent/Items/Weapons/BaseWeapon.cs
@@ -2286,6 +2286,7 @@ public abstract partial class BaseWeapon
             if (a == null && move == null)
             {
                 Sparks.TryProcOnNormalHit(attacker, defender, ExtendedWeaponAttributes.HitSparks);
+                Swarm.TryProcOnNormalHit(attacker, defender, ExtendedWeaponAttributes.HitSwarm);
             }
         }
 
diff --git a/Projects/UOContent/Items/Weapons/Swarm.cs b/Projects/UOContent/Items/Weapons/Swarm.cs
new file mode 100644
index 000000000..cdc37f006
--- /dev/null
+++ b/Projects/UOContent/Items/Weapons/Swarm.cs
@@ -0,0 +1,196 @@
+using System;
+using System.Collections.Generic;
+using ModernUO.CodeGeneratedEvents;
+using Server.Collections;
+using Server.Engines.BuffIcons;
+using Server.Mobiles;
+
+namespace Server.Items;
+
+public static class Swarm
+{
+    internal const int TickCount = 3;
+    internal const int RawDamage = 10;
+
+    internal static readonly TimeSpan TickInterval = TimeSpan.FromSeconds(5.0);
+    internal static readonly TimeSpan EffectDuration = TimeSpan.FromSeconds(15.0);
+
+    private static readonly Dictionary<Mobile, SwarmContext> _contexts = [];
+
+    public static void TryProcOnNormalHit(Mobile attacker, Mobile defender, int hitSwarmChance)
+    {
+        if (!Core.TOL || hitSwarmChance <= 0 || attacker == null || defender == null)
+        {
+            return;
+        }
+
+        if (!IsValidCombatant(attacker) || !IsValidCombatant(defender))
+        {
+            return;
+        }
+
+        if (hitSwarmChance <= Utility.Random(100))
+        {
+            return;
+        }
+
+        if (_contexts.ContainsKey(defender))
+        {
+            return;
+        }
+
+        _contexts[defender] = new SwarmContext(attacker, defender);
+    }
+
+    internal static int ApplySwarmTick(Mobile attacker, Mobile defender, int rawDamage)
+    {
+        if (!Core.TOL || !IsValidCombatant(attacker) || !IsValidCombatant(defender))
+        {
+            return 0;
+        }
+
+        if (HasBurningTorchEquipped(defender))
+        {
+            ClearDefender(defender);
+            return 0;
+        }
+
+        var defenderHits = defender.Hits;
+        AOS.Damage(defender, attacker, rawDamage, false, 100, 0, 0, 0, 0);
+        return Math.Max(0, defenderHits - defender.Hits);
+    }
+
+    internal static bool HasActiveContext(Mobile attacker, Mobile defender) =>
+        attacker != null && defender != null && _contexts.TryGetValue(defender, out var context) && context.Attacker == attacker;
+
+    internal static bool HasActiveContext(Mobile defender) => defender != null && _contexts.ContainsKey(defender);
+
+    internal static int ActiveContextCount => _contexts.Count;
+
+    internal static int GetTicksRemainingForTests(Mobile attacker, Mobile defender) =>
+        HasActiveContext(attacker, defender) ? _contexts[defender].TicksRemaining : 0;
+
+    internal static bool TickForTests(Mobile attacker, Mobile defender)
+    {
+        if (!HasActiveContext(attacker, defender))
+        {
+            return false;
+        }
+
+        _contexts[defender].Tick();
+        return true;
+    }
+
+    internal static void ClearAll()
+    {
+        foreach (var context in _contexts.Values)
+        {
+            context.Stop();
+        }
+
+        _contexts.Clear();
+    }
+
+    [OnEvent(nameof(PlayerMobile.PlayerDeathEvent))]
+    [OnEvent(nameof(PlayerMobile.PlayerDeletedEvent))]
+    [OnEvent(nameof(BaseCreature.CreatureDeathEvent))]
+    [OnEvent(nameof(BaseCreature.CreatureDeletedEvent))]
+    public static void Clear(Mobile mobile)
+    {
+        if (mobile == null)
+        {
+            return;
+        }
+
+        using var defenders = PooledRefList<Mobile>.Create();
+
+        foreach (var (defender, context) in _contexts)
+        {
+            if (context.Attacker == mobile || defender == mobile)
+            {
+                defenders.Add(defender);
+            }
+        }
+
+        for (var i = 0; i < defenders.Count; i++)
+        {
+            StopContext(defenders[i]);
+        }
+    }
+
+    public static void ClearDefender(Mobile defender)
+    {
+        if (defender == null)
+        {
+            return;
+        }
+
+        StopContext(defender);
+    }
+
+    private static void StopContext(Mobile defender)
+    {
+        if (_contexts.Remove(defender, out var context))
+        {
+            context.Stop();
+        }
+    }
+
+    private static bool HasBurningTorchEquipped(Mobile mobile) =>
+        mobile.FindItemOnLayer<Torch>(Layer.TwoHanded) is { Burning: true };
+
+    private static bool IsValidCombatant(Mobile mobile) =>
+        mobile is { Deleted: false, Alive: true } && mobile.Map != null && mobile.Map != Map.Internal;
+
+    private sealed class SwarmContext
+    {
+        private readonly Mobile _defender;
+        private TimerExecutionToken _tickTimerToken;
+
+        public SwarmContext(Mobile attacker, Mobile defender)
+        {
+            Attacker = attacker;
+            _defender = defender;
+            TicksRemaining = TickCount;
+
+            if (_defender is PlayerMobile pm && BuffInfo.Enabled)
+            {
+                pm.AddBuff(new BuffInfo(BuffIcon.Swarm, 1157328, 1157362, EffectDuration));
+            }
+
+            Attacker.PlaySound(0x00E);
+            Timer.StartTimer(TickInterval, TickInterval, Tick, out _tickTimerToken);
+        }
+
+        public Mobile Attacker { get; }
+
+        public int TicksRemaining { get; private set; }
+
+        public void Stop()
+        {
+            _tickTimerToken.Cancel();
+
+            if (_defender is PlayerMobile pm && BuffInfo.Enabled)
+            {
+                pm.RemoveBuff(BuffIcon.Swarm);
+            }
+        }
+
+        public void Tick()
+        {
+            if (!IsValidCombatant(Attacker) || !IsValidCombatant(_defender) || HasBurningTorchEquipped(_defender))
+            {
+                StopContext(_defender);
+                return;
+            }
+
+            ApplySwarmTick(Attacker, _defender, RawDamage);
+            TicksRemaining--;
+
+            if (TicksRemaining <= 0)
+            {
+                StopContext(_defender);
+            }
+        }
+    }
+}
diff --git a/Projects/UOContent/Misc/AOS.cs b/Projects/UOContent/Misc/AOS.cs
index 5107cb03b..9f86ddc7c 100644
--- a/Projects/UOContent/Misc/AOS.cs
+++ b/Projects/UOContent/Misc/AOS.cs
@@ -76,6 +76,8 @@ namespace Server
             Fix(ref chaos);
             Fix(ref direct);
 
+            var firePostResistDamage = ignoreArmor ? damage * fire / 100 : 0;
+
             if (Core.ML && chaos > 0)
             {
                 switch (Utility.Random(5))
@@ -126,13 +128,16 @@ namespace Server
                 var resPois = m.PoisonResistance;
                 var resNrgy = m.EnergyResistance;
 
+                var fireDamageNumerator = damage * fire * (100 - resFire);
+
                 totalDamage = damage * phys * (100 - resPhys);
-                totalDamage += damage * fire * (100 - resFire);
+                totalDamage += fireDamageNumerator;
                 totalDamage += damage * cold * (100 - resCold);
                 totalDamage += damage * pois * (100 - resPois);
                 totalDamage += damage * nrgy * (100 - resNrgy);
 
                 totalDamage /= 10000;
+                firePostResistDamage = fireDamageNumerator / 10000;
 
                 if (Core.ML)
                 {
@@ -241,7 +246,14 @@ namespace Server
 
             var oldHits = m.Hits;
             m.Damage(totalDamage, from);
-            BattleLust.OnDamageTaken(m, from, Math.Max(0, oldHits - m.Hits));
+            var appliedDamage = Math.Max(0, oldHits - m.Hits);
+
+            if (firePostResistDamage > 0 && appliedDamage > 0)
+            {
+                Swarm.ClearDefender(m);
+            }
+
+            BattleLust.OnDamageTaken(m, from, appliedDamage);
             return totalDamage;
         }
 
@@ -1119,7 +1131,8 @@ namespace Server
         Bane = 0x00000001,
         BattleLust = 0x00000002,
         HitSparks = 0x00000004,
-        BloodDrinker = 0x00000008
+        BloodDrinker = 0x00000008,
+        HitSwarm = 0x00000010
     }
 
     public sealed class ExtendedWeaponAttributes : BaseAttributes
@@ -1176,6 +1189,13 @@ namespace Server
             set => this[ExtendedWeaponAttribute.BloodDrinker] = value;
         }
 
+        [CommandProperty(AccessLevel.GameMaster)]
+        public int HitSwarm
+        {
+            get => this[ExtendedWeaponAttribute.HitSwarm];
+            set => this[ExtendedWeaponAttribute.HitSwarm] = value;
+        }
+
         public void GetProperties(IPropertyList list)
         {
             if (Core.HS && Bane != 0)
@@ -1197,6 +1217,11 @@ namespace Server
             {
                 list.Add(1157326, HitSparks); // Sparks ~1_val~%
             }
+
+            if (Core.TOL && HitSwarm != 0)
+            {
+                list.Add(1157325, HitSwarm); // Swarm ~1_val~%
+            }
         }
 
         public override string ToString() => "...";