Mega Flare

Mega Flare (メガフレア) is a technique in Kingdom Hearts: Chain of Memories, Kingdom Hearts Birth by Sleep, and Kingdom Hearts Re:coded. 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 should be noted that the Mega Flare in the International releases of Kingdom Hearts Birth by Sleep is made weaker, since the Japanese version's Mega Flare is proven to be too powerful.

Mechanics
In Kingdom Hearts: Chain of Memories, Mega Flare is a Sleight.

In Kingdom Hearts Re:coded, Mega Flare is a Finish Command.

In Kingdom Hearts Birth by Sleep, Mega Flare is an Ultimate Magic Command that takes up two slots in the Command Deck, has a maximum level of 6, and a normal reload time of 50 seconds.

Kingdom Hearts Re:coded
In Hollow Bastion library, in a room that, when a switch is activated, three columns of Bug Blox rise. On the top of one of the columns, there is a Rare Prize Block that contains Mega Flare. It should be noted that Mega Flare is only available in Story Mode due to the appearance of the Bug Blox columns.

Kingdom Hearts Birth by Sleep

 * The first recipe has a 100% success rate.
 * Fission Firaga (LV4) + Crawling Fire (LV4)

Origin
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.