Lightning Shot (Thunder Barret in the Japanese version) is a Gunbreaker weaponskill learned at level 15. It deals damage with 150 potency to a single target up to 15 yalms away, and increases Enmity gain.
Thunder Barret is a ground magic Bravery attack for Squall, learned at level 6. It requires 30 CP to equip (15 when mastered), 120 AP to master, and has Melee Low priority. Squall fires a string of lightning that drags the opponent closer which can also destroy stage elements.
Thunder Barret is a Bravery attack for Squall, learned at 9 and requiring 90 AP to master. It is otherwise identical to its previous incarnation.
Thunder is the sound caused by lightning. Depending on the distance and nature of the lightning, thunder can range from a sharp, loud crack to a long, low rumble (brontide).