Betryal
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Betryal was the father of Aristaqis, a well-known Grigori, one of the Sons of God who mated with mortal women, giving rise to a race of giants known as the Nephilim. Betryal mated with woman, claiming her as his wife only to dispose of her later on.
Betryal never knew his son, and soon after Aristaqis's birth had abandoned his human accomplice completely. Indifferent to man and the Lord himself, the Watcher disguised himself and was thereafter lost to all historical documents.