Firestorm is a Command Style that can be used by Terra, Ventus, and Aqua in Kingdom Hearts Birth by Sleep and Kingdom Hearts Birth by Sleep Final Mix. It is activated by using Fire-based Deck Commands.
While using Firestorm, Terra, Ventus, and Aqua's attacks become faster and deal fire damage to enemies with the combo finisher being a burst of fire surging from the user's body. The Finisher consists of the user jumping in the air, charging energy, and hurling a fireball that erupts into multiple pillars of flame.
When using Firestorm, a bright red aura with glowing flames surrounds the user.