XV Trigger Happy is Prompto's final Technique. It is an area attack with a firearm that can break off enemy appendages. It depletes the tech bar by three. After eating one of Prompto's favorite foods at camp, he can do a stronger version of the attack. Trigger Happy takes 72 AP to learn on the Ascension after learning Starshell and Gravisphere.
Trigger Happy's success depends on Prompto's position on the field. It can fail and hit no enemies if he is positioned behind a pillar. When Prompto wields the Calamity or Death Penalty each shot has a chance of inflicting Poison or Instant Death on the opponent. With Quicksilver it's almost guaranteed to break all of the enemies' appendages.
Trigger happy means to react violently, esp. by shooting, on the slightest provocation.