Hello i need help for this problem.So i searched to many times and still not found anything.
I want when a player die or monster did a specify distance it should respawn in base spawn.I want this to anti-train mobs

You can check how returnHome() is implemented on aCis. If you already use aCis, simply edit it and edit needed conditions to fire it (AttackableAI / SiegeGuardAI).

 

A simple teleportTo(getSpawn().getLoc(), 0) is enough.