Aurora Deis is the origin of Tatsuya’s power. In her original timeline, she possessed a magic so powerful it could destroy the world. This magic, known as (or implied to be the root of Tatsuya’s Decomposition/Restoration), allowed her to rewrite reality itself.
Aurora represents the ultimate cost of power. The Yotsuba clan views Tatsuya as a weapon, a broken magician. But Aurora knows the truth: Tatsuya is the success of her research. He is the embodiment of power without the weakness of a human heart. avrora deis
The Russian word for "Aurora," the Roman goddess of the dawn. In scientific terms, it refers to the Aurora Borealis (Northern Lights). Aurora Deis is the origin of Tatsuya’s power
Aurora is essentially a "time traveler," but her existence violates the laws of causality. In the Mahouka universe, information cannot travel backward in time without massive consequences. Aurora survived the destruction of her timeline by abandoning her physical body and transferring her consciousness (her Psions) into the future, eventually manifesting as a consciousness housed within the body of a young girl in the main timeline. Aurora represents the ultimate cost of power