Myth of Bet's Mourning

Bet's Mourning tells the story of an elf whose children are violated out of a desire of domination, and who, devastated by her loss, gifts them the power to take back what was stolen from them.

The origin of the myth is unknown, although it's much more widespread in the north where it's viewed as common knowledge. It's also somewhat used there as an explanation to the A.U.T. condition.