Ur-histachii

Ur-histachii were undead forms of histachii created (possibly exclusively) by the Cult of the Dragon cell in the catacombs of Hlondeth. These doubly damned creatures did not require food or air and were placed inside sealed crypts or used to guard meetings, secret caches, and vaults. They were not allowed near the brood chambers because they could descend into a berserk rage when wounded in battle, and they tended to chew on carrion and small vermin when idle.