Unhallowed Blows

Components V, S, M/DF (a pinch of dust from a destroyed undead creature)
This spell empowers the natural attacks or
unarmed strikes of undead creatures, granting a
+1 enhancement bonus on attack and damage
rolls made by the target with its unarmed strikes
or attacks with one natural attack. This spell can
cause an undead creature’s unarmed strike to
deal lethal damage, but in this case, the attack
does not gain an enhancement bonus.