Tharzax, called the Chattering Prince, is the Abyssal patron of poisonous things that creep and crawl. Its Realm, Driller's Hives, is catalogued as the second Layer of the Abyss.
Sources:
Fiendish Codex I: Hordes of the Abyss, page 156
Dungeon #123 - "Salvage Operation"
Planes of Chaos (Abyss poster map)
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