How about something typical?
Camerlengo’s Hammer
Weapon (any hammer), legendary (requires attunement by a divine spell caster)
You gain a +3 bonus to attack and damage rolls made with this magic weapon. The DC of any divine spell you cast increases by 3, and you gain a +3 bonus to spell attack rolls as well. This item functions as a holy symbol.
When an incapacitated creatures is struck three times (requiring three different attacks) on the head, The creature is instantly destroyed with no capacity for regeneration, resurrection, true resurrection, or returning to life in any capacity. The body instantly is reduced to ash with no heat, and the soul is freed from any binding contracts it made with alive. The soul is then instantly judged and sent to an afterlife based on its action in its life as would any moral in that situation with the soul being unable to use any negotiated contracts to forgo punishments or gain power post life. No outside force can prevent the transfer of this soul to its deserved afterlife.
Thoughts?
Throat Punch Games 