From Diablo Wiki
Thousand Pounder is summoned up in a scripted event. The [[Barbarian]] in the [[
gameplay movie]] is running through the [[Forgotten Tombs]], when he comes upon a circle of five [[Dark Cultist]]s channelling their energy to call up the [[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 made incarnate.
[[Image:Mon-thousand-summon1.jpg|center|thumb|600px|Youths dance, then are sacrificed to call forth Thousand Pounder.]]