Black Cerberus drops a special weapon when you cut off his arm, but there is also secret armor you can acquire during the boss fight. When P.A.X. appears, get him to shoot the white containers along the walls and in the corners with his missiles to break the tanks. When the tanks have been broken, P.A.X. will no longer respawn like he usually does during the Black Cerberus boss fight.Share your knowledge! All pages on WikiGameGuides.com can be edited when logged in. Create an account or log in to make changes to this page.