Foes you mark with your magic suffer even more from the wounds you inflict.

Prerequisite(s): Ability to cast arcane mark, sneak attack +4d6, Rogue's Mark

Benefit: In addition to the benefits from Rogue's Mark, your critical threat range increases by 1 for every 2 dice in sneak attack you possess when you attack foes you have marked (e.g., it increases from 19-20 to 16-20 with 6d6 sneak attack). This ability does not stack with other abilities which improve your critical threat range.