Fire Boost

Fire Boost is an ability from Kingdom Hearts II and Kingdom Hearts: Chain of Memories that increases the strength of the Fire spell and other fire-based attacks. In Kingdom Hearts Chain of Memories and its remake, the Red Nocturne Enemy Card grants this ability. In Kingdom Hearts II, Sora, Donald, and other members of your party can learn this ability. The Bond of Flame Keyblade also utilizes this ability.

Learning the ability

Sora

Sora learns this ability from leveling up. When you learn it is based on which weapon you choose at the beginning of the game. This is when Roxas chooses from the Sword, Staff, or Shield.

• Sword: Level 23
• Staff: Level 33
• Shield: Level 15

Donald

Donald learns after defeating Scar in the Pride Land.

Mulan

Mulan learns it after removing her "Ping" disguise.

Jack Skellington

Jack already has it learned from the first time he joins your party.