Are you sure you killed the four lords?
Seath the scaleless (crystal dragon)
4 Kings (ghost in abyss)
Gravelord Nito (the big boner)
Bed of Chaos (the evil tree)
the bed of Chaos is the one I don't understand,I killed all the monsters i could see and took a soul out of a chest.was there anythink else I should have done.There were so many monsters I didn't know if any of them was the boss.