The Divine Mage: The God-Beloved Dropout Enters the Magic Academy

He was a sorcerer from the divine realm, a master of magic who introduced revolutionary new theories. On the verge of death, he cast a reincarnation spell and was reborn 500 years living as Lucien, the son of a farmer, he discovers a world where the common sense of his past life no longer appliesa world where magical technology has drastically declined?!