When you face the Archfiend at its 1st form, face him directly towards his core (you have to be as close as possible) this will prevent him from hitting you with his arms, but be aware he will attack, so you must evade, and use your arrows and shoot him in the face without doing it manually.

Now once you face his final form, go head on with your Eclipse Blade, so jump and continue to use air attacks, and repeat, so that he cant grab you, or use his ground attacks. When he starts to use his energy beams, evade it by using your inferno ninpo, and continue to attack him until you have defeated him.