Cut them Down, Burn them Out

Inspired by the sixth line of the Crimson Oath, when you oppose the enemies of Lastwall, you aim to excise the rot from the land itself. Make a Strike against an undead creature using a weapon with which you have master proficiency. On a success, in addition to the attack's other effects, the creature takes a –2 status penalty to the DC of any curses, diseases, or poisons it can inflict for 1 round. On a critical success, the undead creature takes the –2 status penalty for 1 round, then a –1 status penalty for an additional round.