My group is giving me s$~% for not killing anyone in a few months. There for i want to make a dungeon with a sole purpose to kill there or at least to put the fear in them. they will be 18. we got a zen archer AC 37, cleric AC 42, barbarian AC 33 wizard AC 28 slayer archer stealth 53. 1 round they can do 400 hp if not more. what should my death dungeon have in it?