Undying Healer: OP MC Regression Litrpg Apocalypse

After being slain by a powerful ancient race, John, renowned as the greatest healer in history, dies with his entire party. Regaining consciousness moments before the System initializes, he is armed with a decade of knowledge and a chance to rewrite his fate, adopting an unprecedented role as an undying, front-line healer. Faced with enemies who see humanity as mere experience and ancient races with destructive plans, John must adapt to combat, face monsters directly, and challenge the expectations of his system to ensure mankind's survival.