Gutsucker the troll lives in this horror house.

The cavern on the left is his larder. He pins his live prey to the ground with huge rocks (DC 25 STR to move) that he rolls on top of them. When he wants to kill them he uses smaller rocks to bash in their heads, especially if they look or act dangerous.

The cavern on the left is his kitchen/bedroom as it were, the orb, dragon skull and his treasure are all contained here.