Lissa'aere the Noxious is the Abyssal+lord of poisonous gases, resembling a funnel of poisonous mist. She considers the Archomental Chan to be her enemy.
She rules the 27th Layer of the Abyss, called Malignebula. She is served by alu-demons, vrocks, and Nabassu. Malignebula is a toxic cloudscape with no solid ground.
Sources:
Hellbound: The Blood War (The Dark of the War, pages 25-26)
Fiendish Codex I: Hordes of the Abyss
"Princes of Elemental Good," Dragon #353 (page 47)
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