Big Bang (ability)

Big Bang is a recurring ability in the Final Fantasy series. It is usually related to Zeromus, and therefore appears as an enemy ability and a summon ability.

Final Fantasy IV
Big Bang makes its first appearance as the ultimate ability of Zeromus. Big Bang inflicts massive damage to all party members and inflicts Sap. Zeromus uses it as his opening move and several more times throughout the battle.

The superboss in the Advance version, Zeromus EG will open with this move.

Final Fantasy IV: The After Years
Big Bang returns along with Zeromus after being resurrected by the Mysterious Maiden. He uses it during the The Blue Planet of Memory chapter as his final attack which then shows to destroy the Crystal Palace.

Final Fantasy X-2
Big Bang is used only by the optional boss, Paragon in Final Fantasy X-2. The ability deals massive non-elemental damage to all members of the opposing party. This is the only recorded time where the boss that uses the ability is unrelated to Zeromus.

Final Fantasy XII
Zeromus uses Big Bang as his ultimate summon ability. The attack is a gravity attack and the damage is calculated by removing Zeromus's current HP from his maximum HP, and multiplying what's left by five. The max damage this can apply is 69425 if Zeromus has a single HP left and is at level 99.

Final Fantasy Tactics A2: Grimoire of the Rift
Zeromus uses Big Bang as its Scion's Wrath. The damage removed is equal to the user's current HP taken from its maximum.