In Kingdom Hearts II, Final Arcana is an action ability exclusive to Final Form. It activates as a combo finisher against a single enemy. It causes Sora combine his Keyblades end-to-end before throwing them forward into an enemy as they rapidly spin. He then telekinetically pulls them apart and has them clash with each other three times, creating bursts of energy to further damage the target. If Finishing Plus is equipped, Sora may cancel the second half of the move with the next finisher.
Learning Final Arcana
Kingdom Hearts II