Both of these fighters are some of Sonic’s strongest opponents! It actually may be more accurate to say “Shadow enemies” but either one works. Black Doom and Mephiles both have stronger forms at their disposal and can easily destroy whole planets. Black Doom is more of a completely offensive fighter while Mephiles has a mix of attack and defense. Mephiles can create force fields which will minimize the damage that Black Doom can deal, while draining his health with the occasional energy blast. After a hard fought battle, Black Doom will go down. Mephiles wins.