#W# Source and Scripts added. Added Scripts/Settings.cs to expose some basic tweak able settings.

Scripts/Items/Weapons/Abilities/FrenziedWhirlwind.cs

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+using System;
+using System.Collections;
+using Server;
+using Server.Spells;
+using Server.Engines.PartySystem;
+
+namespace Server.Items
+{
+	/// <summary>
+	/// A quick attack to all enemies in range of your weapon that causes damage over time. Requires Bushido or Ninjitsu skill.
+	/// </summary>
+	public class FrenziedWhirlwind : WeaponAbility
+	{
+		public FrenziedWhirlwind()
+		{
+		}
+
+		public override bool CheckSkills( Mobile from )
+		{
+			if( GetSkill( from, SkillName.Ninjitsu ) < 50.0  && GetSkill( from, SkillName.Bushido ) < 50.0 )
+			{
+				from.SendLocalizedMessage( 1063347, "50" ); // You need ~1_SKILL_REQUIREMENT~ Bushido or Ninjitsu skill to perform that attack!
+				return false;
+			}
+
+			return base.CheckSkills( from );
+		}
+
+		public override int BaseMana { get { return 30; } }
+
+		private static Hashtable m_Registry = new Hashtable();
+		public static Hashtable Registry { get { return m_Registry; } }
+
+		public override void OnHit( Mobile attacker, Mobile defender, int damage )
+		{
+			if( !Validate( attacker ) )	//Mana check after check that there are targets
+				return;
+
+			ClearCurrentAbility( attacker );
+
+			Map map = attacker.Map;
+
+			if( map == null )
+				return;
+
+			BaseWeapon weapon = attacker.Weapon as BaseWeapon;
+
+			if( weapon == null )
+				return;
+
+			ArrayList list = new ArrayList();
+
+			foreach( Mobile m in attacker.GetMobilesInRange( 1 ) )
+				list.Add( m );
+
+			ArrayList targets = new ArrayList();
+
+			for( int i = 0; i < list.Count; ++i )
+			{
+				Mobile m = (Mobile)list[i];
+
+				if( m != defender && m != attacker && SpellHelper.ValidIndirectTarget( attacker, m ) )
+				{
+					if( m == null || m.Deleted || m.Map != attacker.Map || !m.Alive || !attacker.CanSee( m ) || !attacker.CanBeHarmful( m ) )
+						continue;
+
+					if( !attacker.InRange( m, weapon.MaxRange ) )
+						continue;
+
+					if( attacker.InLOS( m ) )
+						targets.Add( m );
+				}
+			}
+
+			if( targets.Count > 0 )
+			{
+				if( !CheckMana( attacker, true ) )
+					return;
+
+				attacker.FixedEffect( 0x3728, 10, 15 );
+				attacker.PlaySound( 0x2A1 );
+
+				// 5-15 damage
+				int amount = (int)(10.0 * ((Math.Max( attacker.Skills[SkillName.Bushido].Value, attacker.Skills[SkillName.Ninjitsu].Value ) - 50.0) / 70.0 + 5));
+
+				for( int i = 0; i < targets.Count; ++i )
+				{
+					Mobile m = (Mobile)targets[i];
+					attacker.DoHarmful( m, true );
+
+					Timer t = Registry[m] as Timer;
+
+					if( t != null )
+					{
+						t.Stop();
+						Registry.Remove( m );
+					}
+
+					t = new InternalTimer( attacker, m, amount );
+					t.Start();
+					Registry.Add( m, t );
+				}
+
+				Timer.DelayCall( TimeSpan.FromSeconds( 2.0 ), new TimerStateCallback( RepeatEffect ), attacker );
+			}
+		}
+
+		private void RepeatEffect( object state )
+		{
+			Mobile attacker = (Mobile)state;
+
+			attacker.FixedEffect( 0x3728, 10, 15 );
+			attacker.PlaySound( 0x2A1 );
+		}
+
+		private class InternalTimer : Timer
+		{
+			private Mobile m_Attacker;
+			private Mobile m_Defender;
+			private double m_DamageRemaining;
+			private double m_DamageToDo;
+
+			private readonly double DamagePerTick;
+
+			public InternalTimer( Mobile attacker, Mobile defender, int totalDamage )
+				: base( TimeSpan.Zero, TimeSpan.FromSeconds( 0.25 ), 12 )	// 3 seconds at .25 seconds apart = 12.  Confirm delay inbetween of .25 each.
+			{
+				m_Attacker = attacker;
+				m_Defender = defender;
+
+				m_DamageRemaining = (double)totalDamage;
+				DamagePerTick = (double)totalDamage / 12 + 0.01;
+
+				Priority = TimerPriority.TwentyFiveMS;
+			}
+
+			protected override void OnTick()
+			{
+				if( !m_Defender.Alive || m_DamageRemaining <= 0 )
+				{
+					Stop();
+					Server.Items.FrenziedWhirlwind.Registry.Remove( m_Defender );
+					return;
+				}
+
+				m_DamageRemaining -= DamagePerTick;
+				m_DamageToDo += DamagePerTick;
+
+				if( m_DamageRemaining <= 0 && m_DamageToDo < 1 )
+					m_DamageToDo = 1.0; //Confirm this 'round up' at the end
+
+				int damage = (int)m_DamageToDo;
+
+				if( damage > 0 )
+				{
+					m_Defender.Damage( damage, m_Attacker );
+					m_DamageToDo -= damage;
+				}
+
+				if( !m_Defender.Alive || m_DamageRemaining <= 0 )
+				{
+					Stop();
+					Server.Items.FrenziedWhirlwind.Registry.Remove( m_Defender );
+				}
+			}
+		}
+	}
+}