Quote:
Dragon 353: March 2007: Demonomicon: Malcanthet
Unlike the obyriths, who crawled wet and ruinous from the heaving birthflesh of the Abyss itself, the tanar'ri seeded from a much more fertile soil- the mortal spirit. As countless mortals lived and sinned and died, their wicked souls created an endless influx of raw material the Abyss could shape. The process continues to this day, with often transitory tanar'ri breeds emerging from new depravities and mortal failings, only to go extinct without ever coming to the attention of Material Plane scholars who mistakenly consider themselves experts in all things demonic. Yet certain sins are ageless and do not vary across the gulfs of time. Tanar'ri born of these sins form the bulk of demonic life on the Abyss- wrath begets the hateful vrocks, envy the power-hungrey glabrezus, gluttony the ravenous nabassus, and so on.