Asriel Dreemurr (JP: アズリエル・ドリーマー) is the true form of Flowey, and the overarching antagonist of Undertale. As the biological child of Toriel and Asgore, he is the former prince of monsters, as well as being the best friend of the fallen human. At the end of all three routes, Asriel appears in one of his forms, and is the last monster the protagonist confronts. As Asriel, he serves as the final boss of the True Pacifist Route.