Re: FH Gripes
Or if it is tied to a specific weapon that gives the ability when wielded (Holy Avenger) against "Evil".
Deadly Blow could also be set on charges or with a limited time (keeping with the Paladin theme here). "Holy Wrath", Deadly Blow, Any Attack, 1 Charge, Charge recovers when character prays at appropriate altar for an hour.
"Infused Vindication", Deadly Blow, Melee Attacks Only, 1 Charge Lasting 1 Turn, Charge recovers when character makes sacrifice of fresh Moon Lilies.