A Leap to the Near Future: Return of the Greatest Battlemage

The Heavenly Sage Xavier who had just defeated the Demon King Diablo unfortunately met his deathbed besides his dead comrades. As his consciousness thought he will go to the heavens, his expectations was crumbled as he realized he was reborn as A baby in some random village and it was 500 years after the war between Humanity and the Demons. What will await his journey?