Here is an idea.
Fantasy plague god, he gives his followers "Blessings" one of which include parasites. These parasites basically act like sci-fi nanomachines, they give you powers. But instead of tiny robots it's hundreds of tiny parasites wriggling inside of your body.
Fantasy plague god, he gives his followers "Blessings" one of which include parasites. These parasites basically act like sci-fi nanomachines, they give you powers. But instead of tiny robots it's hundreds of tiny parasites wriggling inside of your body.