Prerequisite(s): Arcane Strike, Penetrating Strike, Spell Penetration, base attack bonus +7

Benefit: As Penetrating Strike, except that the bonus to level checks continues to increase by 2 for each successful attack imbued with Arcane Strike made against the target. The bonus still goes away at the end of the turn following the round in which you used Arcane Strike if you have not yet cast a spell on the target.