The Archmage Reborn: Betrayed by My Disciple

Reinhardt, the kingdom's greatest archmage, is betrayed by his disciple Cecil and the crown. With his final breath, he casts a reincarnation spell and awakens as Leon Grey, the eight-year-old son of a ruined border baron. Using his past knowledge, he rebuilds his magic, drives off attackers, revives dead farmland, heals his dying mother, and reclaims stolen mines—saving his new family.