The seat of Yeenoghu’s power is a nameless
layer deep in the Abyss. Known as Yeenoghu’s Realm, it is a wasteland.
Oh really? I guess that explains why it is nameless.
Also, this guy is still vulnerable to flying ranged characters; anyone with a range of more than 22 can just fly around and drop spells or attacks on him, and he can't do a whole lot about them.