#W# New: Portal Spawner that spawns a mob. if the mob doesn't have a combatant after 3 mins it despawns.

Projects/UOContent/Engines/PortalSpawner.cs

@@ -0,0 +1,89 @@
+using System;
+using ModernUO.Serialization;
+using Server.Items;
+using Server.Mobiles;
+using Server.Network;
+
+namespace Server.Custom.Events
+{
+    [SerializationGenerator(0)]
+    public partial class PortalSpawner : Item
+    {
+        private bool _triggered;
+
+        [Constructible]
+        public PortalSpawner() : base(0x0F6C)
+        {
+            Name = "a horrific tear";
+            Hue = 1157;
+            Movable = false;
+            Light = LightType.Circle300;
+        }
+
+        public PortalSpawner(Serial serial) : base(serial)
+        {
+        }
+
+        public override bool HandlesOnMovement => true;
+
+        public override void OnMovement(Mobile m, Point3D oldLocation)
+        {
+            base.OnMovement(m, oldLocation);
+
+            if (_triggered || Deleted)
+                return;
+
+            if (m.AccessLevel > AccessLevel.Player || !m.Alive || !(m is PlayerMobile))
+                return;
+
+            if (Utility.InRange(Location, m.Location, 8))
+            {
+                TriggerAmbush(m);
+            }
+        }
+
+        private void TriggerAmbush(Mobile target)
+        {
+            _triggered = true;
+
+            Effects.PlaySound(Location, Map, 0x20F);
+            Effects.SendLocationEffect(Location, Map, 0x3728, 10, 10);
+            Effects.SendLocationEffect(Location, Map, 0x3709, 10, 30, 1153, 0);
+
+            try
+            {
+                BaseCreature ambushMonster = null;
+                string ambushMessage = "A terrifying creature bursts from the portal!";
+
+                switch (Utility.Random(2))
+                {
+                    case 0:
+                        ambushMonster = new PortalDaemon();
+                        ambushMessage = "A daemon tears through the portal to ambush you!";
+                        break;
+                    case 1:
+                        ambushMonster = new PortalWyvern();
+                        ambushMessage = "A furious dragon bursts through the portal to ambush you!";
+                        break;
+                }
+
+                if (ambushMonster != null)
+                {
+                    ambushMonster.MoveToWorld(Location, Map);
+                    ambushMonster.PlaySound(ambushMonster.GetAngerSound());
+
+                    ambushMonster.Combatant = target;
+
+                    target.SendMessage(89, ambushMessage);
+                }
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine($"Error spawning portal monster: {e.Message}");
+            }
+
+            Delete();
+        }
+
+    }
+}

Projects/UOContent/Mobiles/Monsters/Custom/PortalSpawns/PortalDaemon.cs

@@ -0,0 +1,45 @@
+using System;
+using Server;
+using ModernUO.Serialization;
+using Server.Items;
+
+namespace Server.Mobiles
+{
+    [SerializationGenerator(0, false)]
+    public partial class PortalDaemon : Daemon
+    {
+        // Removed [Save] - it will now self-clean automatically on server restarts!
+        private DateTime _DespawnTime;
+
+        [Constructible]
+        public PortalDaemon() : base()
+        {
+            // Give it 3 minutes of inactivity before it despawns
+            _DespawnTime = DateTime.UtcNow + TimeSpan.FromMinutes(3);
+        }
+
+        public override void OnThink()
+        {
+            base.OnThink();
+
+            if (Deleted) return;
+
+            if (Combatant != null)
+            {
+                // As long as it is fighting a player or pet, constantly reset the clock
+                _DespawnTime = DateTime.UtcNow + TimeSpan.FromMinutes(3);
+            }
+            else if (DateTime.UtcNow > _DespawnTime)
+            {
+                // The clock ran out and it has no combatant. Clean it up!
+                Effects.SendLocationEffect(Location, Map, 0x3728, 10, 10); // Smoke puff
+                PlaySound(0x1FD); // Eerie fade out sound
+                Delete();
+            }
+        }
+
+        public PortalDaemon(Serial serial) : base(serial)
+        {
+        }
+    }
+}

Projects/UOContent/Mobiles/Monsters/Custom/PortalSpawns/PortalWyvern.cs

@@ -0,0 +1,41 @@
+using System;
+using Server;
+using ModernUO.Serialization;
+using Server.Items;
+
+namespace Server.Mobiles
+{
+    [SerializationGenerator(0, false)]
+    public partial class PortalWyvern : AncientWyvern
+    {
+        private DateTime _DespawnTime;
+
+        [Constructible]
+        public PortalWyvern() : base()
+        {
+            _DespawnTime = DateTime.UtcNow + TimeSpan.FromMinutes(3);
+        }
+
+        public override void OnThink()
+        {
+            base.OnThink();
+
+            if (Deleted) return;
+
+            if (Combatant != null)
+            {
+                _DespawnTime = DateTime.UtcNow + TimeSpan.FromMinutes(3);
+            }
+            else if (DateTime.UtcNow > _DespawnTime)
+            {
+                Effects.SendLocationEffect(Location, Map, 0x3728, 10, 10);
+                PlaySound(0x1FD);
+                Delete();
+            }
+        }
+
+        public PortalWyvern(Serial serial) : base(serial)
+        {
+        }
+    }
+}