Rage Form

Rage Form is a Formchange in Kingdom Hearts III. It has a chance to activate when Sora reaches critical health, regardless of current Keyblade.

Kingdom Hearts III
During Sora's final fight against Xehanort in Scala ad Caelum, Xehanort uses the power of Kingdom Hearts to absorb Sora's light, forcing him into Rage Form. By attacking Xehanort, Sora is able to regain his light.

Appearance
Rage Form turns Sora's clothes, skin, and Keyblade deep black, with glowing red eyes, an aura of darkness, and a fluorescent white swirling pattern on his pants. It is similar to AntiForm and envelops Sora's Keyblade in darkness for quick and powerful attacks. While AntiForm represents Sora overcome by darkness, Rage Form represents Sora's anger.

While in his Kingdom Hearts II attire, Sora's appearance in Rage Form is identical to AntiForm.

Mechanics
When in Rage Form, Sora can use Riskcharge as a situation command, raising his Strength and enhancing the properties of certain attacks such as his combo finisher at the cost of depleting half his remaining health. After using Riskcharge three times, Sora gains access to Rage Form's finish command, which consists of Sora plunging his Keyblade into the ground and submerging the area around him in darkness. Orbs of darkness surround Sora before generating spikes and spinning around, delivering massive damage.

During the final fight against Xehanort, Riskcharge is unavailable. To obtain the Finish command, Sora must instead attack Xehanort enough and fill the situation meter using the Focus orbs he drops.

Strategy
Rage Form is the only Formchange available that replenishes Sora's HP upon activation, making it useful when in low health situations.