The Chosen ArchMage: A LitRPG Fantasy - Mark Alan

Ian Vale was never meant to be a hero. He was just a healer with a leaky mana pool and an academy that repeatedly rejected him. When a desperate dungeon run puts him face-to-face with a Lesser God, Ian doesn't die, he sacrifices himself into a looping doom spell, becoming something greater than the kingdom has ever seen. Ian conquers the dungeon as The Chosen ArchMage, tasked with saving a kingdom even his newfound powers will struggle against.