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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.
Big Bang returns along with Zeromus after being resurrected as Zeromus's Malice by the Mysterious Girl. He uses it during the Lunarian chapter as his final attack, which then shows to destroy the Crystal Palace.
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 is left by five. The max damage this can apply is 69,425, if Zeromus has a single HP left and is at level 99.
Big Bang is used by the final form of Chaos. The attack inflicts major non-elemental damage to all members of the opposing party. After Chaos is defeated, he uses an upgraded version called Bigger Bang.
This ability is used by the final boss known as Chaos Elgo. It is very powerful and affects the whole party by dealing non-elemental magic damage.
Big Bang is the enemy ability that is used by Zeromus during battle.