Mariah (The Son of Tyrael)

Mariah, a former Archangel of Magic, now a Supreme Goddess of Power is a friend of Malum and a mentor of Tyrael. He appears first time in Series 2, where Malum is corrupted by Diablo's evil plans.

Powers
Omnipotent beings can do everything, so there is no need to write all powers here, but the ones she uses mostly, are:
 * Omnipotence - Mariah can do absolutely everything. There are no limitations for her.
 * Incarnation - if someone kills Mariah, then she just resurrects after some time.
 * Teleportation - Mariah can teleport even from High Heavens to Hell without using any portals.
 * Order Manipulation - Mariah can change order and laws in every realm, even in Hell.