Archmage Transcending Through Regression

Mikhail Walpurgis didn't feel qualified for the title of Hero, and instead let the warrior Siegfried lead the prophesied battle against the Devil. But after Siegfried dies and the army is defeated, Mikhail has one last move before the end of the world. And so he turns back time. Now, Mikhail has the chance to reclaim the title he gave up and save everyone. The only problem is, no one believes the prophecy about the war! Can Mikhail manage to gather an army and make this life count?