||This bolts' damage seems to be randomized fairly high in contrast to other distance weapons. 5 of them can be created using the Conjure Piercing Bolt spell. It's an option between normal bolts and power bolts.
An article from Tibianews, published 21. october 2007, suggests that the attack rate for Piercing Bolt is 33. Previously it has been believed that the attack rate is 35.