Mega Flare

Mega Flare is a Deck Command in Kingdom Hearts Birth by Sleep that can be obtained by Ventus, Terra, and Aqua. Mega Flare is made by melding Fission Firaga and Crawling Fire. Once used, the caster fires a fireball that, upon impact of an enemy, creates a blinding, screen-distorting explosion that heavily damages all enemies on screen. It requires two slots to equip. It should be noted that the NA/E Mega Flare command is made weaker, since the Japanese version's Mega Flare is proven to be too powerful.

Etymology
Mega Flare is a recurring attack in the Final Fantasy series. It often appears as the Summon creature Bahamut's signature attack. It is depicted as an upgraded form of the Flare spell, and deals massive non-elemental damage to all enemies.