Cascade
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2000 years ago, a human prophet of The Ages was drowned as punishment for anti-establishment rhetoric and attempting to incite rebellion. Since then the human lineage has never been the same. Divergences from the base human line created great rifts and these new "Ancestries" began to form their own communities. Some retained much of their human image, Elves, Dwarves, and similar Ancestries could even occasionally pass for human, while others such as Drakona, Fungril, and Faeries became significantly more distinct.
These changes happened so rapidly that a name was eventually given to the phenomenon: The Cascade