Han Fei didn't plan to give himself too much time to cultivate. For him, the best cultivation was fighting.
Furthermore, his top priority was not to cultivate, but to find a path that was suitable for him. As for the Godfiend Formless Technique, it seemed to be a path perfectly compatible with him.
Once this path was taken, coupled with the Star Devouring Technique, he might be able to reach the heights where even the God of War hadn't reached. And the greatest disadvantage of the Supreme Divine Technique, the problem of soul and physique incompatibility, might be correspondingly resolved.
Han Fei didn't ask the God of War about this matter. After all, the Godfiend Formless Technique belonged to the demonic path. God knew what taboo it would violate.
Han Fei planned to try it first. If he could really succeed, it wouldn't be too late to tell the God of War after he proved Dao.
