A paladin on the facebook group did some testing on PF. It scales with power, some buffs and debuffs and Feytouched. It behaves more like a debuff; your at-wills apply 1 PF and it does x% weapon damage, then it does nothing for 60 seconds until you apply another PF. Once it stacks 5x; you cannot apply another stack and…
It adds 3 charges of bonus radiant dmg to any single target atk like at wills, smite, and bane of all things. I dont know the exact nu.bers but it does do good dmg. If i use it its mostly in single target in conjuction with CoP and smite.