How you beat archfiend in ninja gaiden 2

For the first stage: Get out your fiend's bow. If you don't have arrows for it, there should be a corpse at the right of the stage that has arrows. What you need to do is shoot the archfiend in the head, then when the crystal at the center of his body glows, shoot it. When he summons spirits to attack you, use a weapon that attacks quickly and is a rapid attack weapon, such as the lunar staff. After you get his HP down to about either 1/2 or 1/3, he will smash the wall to the right, and you will have to follow the path to continue the battle. For the second stage: First off, this is for after you get the archfiend's HP down all the way, and not the 1/2 or 1/3 I was talking about earlier. What you need to do is get your best weapon, and when he's perched on the cliff or standing on the stage, attack him with your best weapon while dodging attacks.