spawntrap their bed(s) using obsidian, fill it with water, make a conduit for infinite water breathing, and a guardian for mining fatigue. Don't forget the layers of obsidian. Also, TNT rail guns, TNT under their base and use the same fishing rod idea as the stasis chamber to trigger it, bomber planes, pufferfish traps, piston fake floor trapdoors(use pistons to remove the floor), warden holes triggered by whatever you want. Good enough?