Well you and the deathknight are connected so if you or the DK dies the other one dies too and game over. Then theire are the summoning dolls that can also die but don't end the game. I heard theire was a penalty when you try to ressurect a summoning doll but don't know the details. The dolls can be found in the game world I tought.
PS: Morbo thinks that futurama Rulez MUHAHAHA <img src="/ubbthreads/images/graemlins/up.gif" alt="" />
