Harry Potter: Master of Talismans

A second life, a magical one. That was what Oswald Mercer discovered after being reborn in Britain. Magic, you know what would be even better than that? Having been a huge fan of the world he was reborn into. What a shame he wasn't.

He arrived without a system, without quests, and without even having complete memories of the world he had awakened in. But even if he did not have the entire plot in his mind, he still had ideas. Ideas about how to use magic.

Why couldn't a spell be prepared in advance? And the world was giving him exactly what he needed to find out: Runebark.

Oswald has no intention of becoming another puppet in the Wizarding World. He does not know the entire plot, but that does not matter. It would have mattered if the world had remained the same.