Brain golem

Contrary to their name, brain golems are not golems, but are in fact a race of horribly corrupted demons. What the original species looked like is completely unknown to all except the most ancient of brain golems. Brain golems travel the prismatic dark searching for fresh meat to consume, as each pound of meat devoured increases the brain golem's intelligence.

Some of the oldest, and therefore most intelligent brain golems, are captured and used as biological computing devices for the Black Order.