Life has taught you to disable spellcasters with your firearms.
Benefit(s): If you ready a ranged attack with a firearm to attack a spellcaster when he begins casting a spell and successfully hit your opponent, you can expend 1 grit point to increase the target’s concentration check DC for being injured while casting by 5.
Note If using the optional Stamina Pool rules, the following trick may be used with this feat.
Combat Trick: When using Casterbane Shot, you can spend up to 5 stamina points to increase the DC of the concentration check imposed by the feat by an amount equal to the number of stamina points spent.
Pathfinder Campaign Setting: Inner Sea Combat © 2014, Paizo Inc.; Authors: Dennis Baker, Jesse Benner, John Compton, and Thurston Hillman.