Known as the Winter Warlock, Aseroth is the ruler of the 566th Layer of the+Abyss, called Soulfreeze. He is the lord of ice and cold.
Soulfreeze has a two-way portal to the Paraelemental+Plane+of+Ice. The key is a mortal soul, which is destroyed in the process.
Sources:
Fiendish Codex I: Hordes of the Abyss, page 155.
Soulfreeze was originally mentioned in The Inner Planes, page 70
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