Haiogh-Yai is a monstrous, amorphous, whirling entity who took his abode within a wandering black hole called Vix'ni-Aldru in the Elder Lore. It also hosts a city made of titanic blocks, inhabited by mysterious creatures resembling either worms or lizards.
Behind the Mythos
Haigh-Yai was created by James Ambuehl as part of the Lu-Kthu Cycle.