HP: Ouroboros' Redemption

Eric Rozier, a son of a rebel who was supposed to be born during the era of Voldemort's rise, accidentally traveled through the millennium and landed in the Merlin era due to a magical riot at his birth. He once had great ambitions to revolutionize the magical world and tried to reshape order with wisdom beyond the times, but he was shocked to realize that changing history would completely disappear him from existence. In desperation, he could only fake his death and escape, hiding in the shadow of history. For thousands of years, he relied on the magic stone to extend his life, silently correcting the historical trajectory distorted by his own interference, and became an unknown "ouroboros" in the magic world. It wasn't until the day Harry Potter boarded the Hogwarts Express that the oppressive feeling of historical revision finally dissipated. Eric re-entered the wizarding world as an orphan of the Rosier family and became a student of the same class as Harry Potter. With thousands of years of wisdom and secrets, he not only guides the growth of the "Savior" in Gryffindor's passion and adventure, but also secretly repairs the historical wounds. Facing the return of Voldemort, how will this "old monster" who has lived for thousands of years find a balance between protecting history and fighting the darkness with his magical attainments that transcend the times? A journey of redemption spanning a thousand years begins.