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We don't know what the [[Gluttony]] and [[Incarnate]] attributes on him mean exactly yet.
Thousand Pounder is summoned up in a scripted event. The Barbarian in the gameplay demo is running through the dungeon, when he comes upon a circle of five [[Dark Cultist]]s channeling their energy to call up a demon. At first there are three pale-skinned youths dancing in the circle. They explode one by one, and then from their blood and flesh the demon is conjured.