Command Style

The Command Style is a battle system introduced in Kingdom Hearts Birth by Sleep. When Terra, Ventus, and Aqua fill up the Command Gauge with the correct types of attacks and Deck Commands, they can undergo a Style Change which grants increased strength and new weapon combos. There are some shared Command Styles that all three characters can utilize, and some exclusive Styles that only one can perform. The enhanced Magic and physical attacks made available by Command Styles create more effective methods and strategies of combat.

Mechanics
Upon meeting certain requirements while filling up the Command Gauge, located above the Command Deck, a character may undergo a Style Change rather than executing a finishing attack. Every style change has certain requirements for activating; an example of executing Diamond Dust would be to fill up part of the Command Gauge with Blizzard-type attack.

While using a Level 1 Command Style, the player can further achieve a second level by filling up the Command Gauge an additional time. For example, if Ventus fills Firestorm's Command Gauge with Aero-related commands, the result will be the powerful Cyclone Command Style.