Formchange

Formchange is a mechanic introduced in Kingdom Hearts III. Formchange allows Sora to change his abilities or the form of his Keyblade. Formchanges are triggered after achieving sufficient damage with a Keyblade. Certain Keyblades will also have the ability to Formchange a second time. Formchange is a similar mechanic to Command Styles and Drive Forms

Trivia

 * While Formchange as a mechanic has not been introduced until Kingdom Hearts III, the act of transforming Keyblades has been in previous games. In Kingdom Hearts II Final Mix, the Lingering Will is able to change his Keyblade into different forms and sets, in Kingdom Hearts Birth By Sleep Final Mix, No Heart is able to morph their Keyblade, and Young Xehanort also is able to morph his keyblade in Kingdom Hearts 3D: Dream Drop Distance.