Grima_

You may have heard of the artificial dragon created by a scientist.
It’s childhood grew with living under its creator’s care. As time went on, the creature grew, and developed strange things. it could speak telepathically with its creator, but began to show feelings of malevolence towards life and mankind. The creator, knowing about the possible evil he was about to unleash on the world, tried to cull the dragon, but failed and lost his life to the beast.
It’s name was Grima, and it went on to be a monster of darkness for millennia.

She slaughtered thousands and was believed to be immortal and unbeatable. But that was until Avatar.
A person bearing the omnipotent power of Grima was the only hope, for Grima could only perish by her own power. In the final confrontation, Avatar had the choice to slay Grima herself and risk dying with her, or stay and let someone else take the final blow to put me in slumber for a millennia.
...Avatar chose the latter.

Once struck down by Avatar’s ally, Grima lived, but was sent away from the world to rest and restore her power. She ended up in Nexus as a result, being left in a very weak state.
She now wanders these strange lands in her human form. She still is strong in magic, but very weak compared to her full power before.