Isekai: Reborn by Mistake — Bound to an Unknown Baddie

You died in an accident that was never meant to happen. A mysterious entity known as "The Watcher" takes responsibility and offers you a second life in a high fantasy world. But you are not sent alone. Something is bound to you—an unknown entity with overwhelming power that lives within you, yet can take physical form. With this unnatural existence inside you, your new life begins… far from ordinary.