The Vampire god Kanchelsis was said - in the most secret of myths - to have been created accidently when the Seldarine
attempted a ritual that involved sacrificing their own blood. This
blood was corrupted by a human god of evil, and the corrupted blood
became Kanchelsis, a being divided between his urbane, sophisticated
aspect - the Rake - and a savage horror known as the Beast. Kanchelsis
dwells in the Abyss in the layer catalogued as the 487th, the so-called Lair of the Beast and Mansion of the Rake.
Sources:
Monster Mythology
Fiendish Codex I: The Lost Annals
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