Piston

Piston is the first NPC encountered in Mr. Torgue's Campaign of Carnage. He becomes the first "sponsor" for the arena battles, before being replaced by Mad Moxxi.

Throughout the events of Mr. Torgue's Campaign of Carnage, Piston is referred to as a cheater, and eventually plays the part of the "blood of the coward" in the opening of the third vault.