That's an excellent question, and to be honest I forget the answer. I know that a monster will sometimes choose to attack the player with the lowest remaining hit points, but I forget all the circumstances surrounding that, and I don't know what happens in the context of blocking, etc.. I don't want to start guessing blindly either. I'll have to research that in detail sometime. Anyone else know the answer? Thanks for the question. :) I think that the monster attacks the player with the lowest combat level. When me (level 90) and a level 57 friend were at black demons, i had about 30 hp left, and he had full, he got attacked.