Synch Blade

Synch Blade is an ability which allows a Keyblade wielder to use two Keyblades at once during battle. It is unknown if in the Kingdom Hearts series, there are any characters that are able to equip this ability. So far, only Roxas is able to use this ability to summon his two Keyblades naturally, the Oblivion and the Oathkeeper in battle, and Sora while in Valor Form, Master Form, and Final Form.

Sora appears to be able to use Synch Blade during the final battle with Xemnas without using any drives.

Tetsuya Nomura stated that Roxas' ability to use two Keyblades implies that Sora can use Synch Blade without the Drive Forms, due to the fact that Roxas has every ability that Sora has.

During Another side, Another story, after Roxas throws Oblivion to Riku, the Kingdom Key appears in his hand. This may mean the Synch blade ability allows the user to 'create' as many Keyblades as they need, though usually only summoning the amount they can easily wield at once.