Said to be even more ancient than Pale Night, Dwiergus, the Chrysalis Prince, has control over the shaping of demonic races. His Layer of the+Abyss, Fleshforges, is catalogued as the 558th.
In the past, he seems to have tutored Baphomet.
Sources:
Dragon #341, page 24
Fiendish Codex I: Hordes of the Abyss, page 155
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