Haagenti is the Abyssal+Lord of Alchemy. His Layer of the Abyss is catalogued as the 548th, known as Garavond. Zuggtmoy is sometimes seen cavorting in his palace.
Haagenti is also the name of an unrelated Vestige.
Sources:
Fiendish Codex I: Hordes of the Abyss
Dragon #337
Book of Fiends: Armies of the Abyss
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