Ashbound Mark( Dragonmarked, p. 135)
As a member of the Ashbound sect, you use the power of your dragonmark to rid the world of those who practice arcane magic.
any true or aberrant dragonmark, Ashbound,
Against creatures that can cast arcane spells, the saving throw DC of spells you cast increases by 2. In addition, you gain a +1 bonus on attack rolls against any creature that can cast arcane spells.