Archmage Transcending Through Regression is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Mikhail Walpurgis, the world’s only 9th-circle Archmage, fell in battle due to a damned hero, and managed to cast one final advanced magic spell, . As time rewound, he regressed to 20 years ago. “Fine. I’ll just become the hero instead.”