This spell makes a weapon magically armor ignoring. None of an opponent’s Protection applies against the damage of the weapon. If cast on projectiles, such as arrows, sling stones, or crossbow bolts, the armor ignoring effect on a particular projectile ends after one use, whether or not the missile strikes its intended target. (Treat shuriken as arrows, rather than as thrown weapons, for the purpose of this spell.) You cannot cast this spell on a natural weapon, such as a claw.