Blessed Thorn Strike

Requirements You witnessed an enemy harm an ally with a Strike or spell last round.

When you see a foe hurt one of your allies, your righteous retribution causes your weapon to sprout holy thorns. Make a Strike against the triggering enemy. If you hit and deal damage, the target must also succeed at a fortitude saving throw against your class DC or spell DC, whichever is higher, or become Enfeebled 1 (or Enfeebled 2 on a critical failure).