Dark Old Demon
She was a chosen... so her soul has a "buff" basically. It's not really that hard to understand. The dragon gods were on the level of demon kings so of course they can create other beings of similar power. Yall act like you never read the story. SHEEESH. In the darksiders world, The demon king level succubus lady made a demon king level dragon.... out of that angel... soo yeah its possible. Not a asspull