ModernUO/Projects/UOContent/Items/Misc/UnholyBone.cs

using System;
using Server.Mobiles;

namespace Server.Items
{
    public class UnholyBone : Item, ICarvable
    {
        private SpawnTimer m_Timer;

        [Constructible]
        public UnholyBone() : base(0xF7E)
        {
            Movable = false;
            Hue = 0x497;

            m_Timer = new SpawnTimer(this);
            m_Timer.Start();
        }

        public UnholyBone(Serial serial) : base(serial)
        {
        }

        public override string DefaultName => "unholy bone";

        public void Carve(Mobile from, Item item)
        {
            Effects.PlaySound(GetWorldLocation(), Map, 0x48F);
            Effects.SendLocationEffect(GetWorldLocation(), Map, 0x3728, 10);

            if (Utility.RandomDouble() < 0.3)
            {
                if (ItemID == 0xF7E)
                {
                    from.SendMessage("You destroy the bone.");
                }
                else
                {
                    from.SendMessage("You destroy the bone pile.");
                }

                var gold = new Gold(25, 100);

                gold.MoveToWorld(GetWorldLocation(), Map);

                Delete();

                m_Timer.Stop();
            }
            else
            {
                if (ItemID == 0xF7E)
                {
                    from.SendMessage("You damage the bone.");
                }
                else
                {
                    from.SendMessage("You damage the bone pile.");
                }
            }
        }

        public override void Serialize(IGenericWriter writer)
        {
            base.Serialize(writer);

            writer.Write(0); // version
        }

        public override void Deserialize(IGenericReader reader)
        {
            base.Deserialize(reader);

            var version = reader.ReadInt();

            m_Timer = new SpawnTimer(this);
            m_Timer.Start();
        }

        private class SpawnTimer : Timer
        {
            private readonly Item m_Item;

            public SpawnTimer(Item item) : base(TimeSpan.FromSeconds(Utility.RandomMinMax(5, 10))) => m_Item = item;

            protected override void OnTick()
            {
                if (m_Item.Deleted)
                {
                    return;
                }

                var spawn = Utility.Random(12) switch
                {
                    0  => (Mobile)new Skeleton(),
                    1  => new Zombie(),
                    2  => new Wraith(),
                    3  => new Spectre(),
                    4  => new Ghoul(),
                    5  => new Mummy(),
                    6  => new Bogle(),
                    7  => new RottingCorpse(),
                    8  => new BoneKnight(),
                    9  => new SkeletalKnight(),
                    10 => new Lich(),
                    11 => new LichLord(),
                    _  => new Skeleton()
                };

                spawn.MoveToWorld(m_Item.Location, m_Item.Map);

                m_Item.Delete();
            }
        }
    }
}