Coup De Grace

As a Multi Action, using two Basic Actions, a character can use a weapon in melee to deliver a coup de grace (pronounced “coo day grahs”) to a helpless opponent. They can also use a ranged weapon such as a bow, crossbow or spell, provided they are adjacent to the target.
The character automatically hits with this special attack and it counts as a critical hit. If the target survives the damage, they must make a Body save (DC 10 + damage dealt) or die. A character also gets their extra sneak attack damage, in addition to any effects triggered by sneak attacks or critical hits, against the target when delivering the coup de grace.
Delivering a coup de grace provokes attacks of opportunity from threatening opponents.
A character can’t deliver a coup de grace against a target that is immune to critical hits. They can deliver a coup de grace against a creature with total concealment, but doing this requires four consecutive Basic Actions as part of a Multi Action, two to “find” the target, once they have determined what square it’s in, and two to deliver the coup de grace.