Deathblow (Commando ability)

Deathblow is a recurring ability in Final Fantasy series, originating in Final Fantasy XIII.

Final Fantasy XIII
Deathblow is a Commando auto-ability which when attacking foes below a certain HP threshold, there is a chance to kill them in one hit; if the target's remaining HP is less than 1.2 times the damage that would have been dealt, damage will become 1.5 times the normal. It is available to Snow, Vanille and Fang at Role levels 5, 9 and 7 respectively.

Final Fantasy XIII-2
Deathblow functions the same as in Final Fantasy XIII. It is usable only by Noel at Role level 50.