Pillar of Skulls

The Pillar of Skulls is a hideous landmark in the Nine Hells, it contains the skulls of practically any race or creature from dragons to drow but probably mostly weak devils. No-one in Baator knows whose skulls they are, but the devils say that the are the skulls of the victims of the blood war. Those unfortunate enough to be absorbed into the pillar will keep their mind and consciousness but exist only as a single skull in an endless filthy rotting pile. The pillar itself is an autonomous entity and its knowledge grows as beings are absorbed into it. The pillar towers miles into the sky of Avernus and up close the skulls seem to act individually, some laughing manically, others weeping and screaming, skulls surface and sink in the pillar and the endless chorus of chattering skulls can be heard for many miles around. It is said that the skulls of the truly wicked, cowardly, and the greatest liars and betrayers are the only non-demon occupants of the pillar. There are those who attempt to bargain with the pillar in attempt to gain some specific knowledge contained by one or any of the resident skulls, it will answer, but in return a sacrifice must be made... It likes warm flesh most of all, but will accept information it deems important(usually probably just so it can sell the information to some greater devil simply so it can absorb more beings in exchange for the information), it controls a large battalion of devils on Avernus and orders troops to fight frequently in the Blood War.