The boss of the Leechmonger Archstone.
The Dirty Colossus is a deformed creature that arose from the compounded filth that accumulated in the Valley of Defilement. It has a golem-like figure with a spiky red carapace which is covered in brown slime and wooden planks. Its sensitive abdomen is protected by a shabby wooden barrel. A cloud of flies is constantly buzzing around its head. A fat maggot-like growth covered in stitches sprouts from Dirty Colossus's left shoulder.