Dark Aura

Dark Aura (ダークオーラ) is an ability which appears in Kingdom Hearts: Chain of Memories and Kingdom Hearts II. It has two forms. The first consists of Riku rapidly opening portals of darkness and rushing out of them at the opponent with his blade, then slamming the ground to summon a column of light that confuses the enemy. The second, used only in Kingdom Hearts II, consists of Riku firing orbs of darkness which stop the enemy's movement. In Kingdom Hearts II, it requires 2 AP to equip and 10 MP to use.

Kingdom Hearts: Chain of Memories

 * Riku learns Dark Aura by obtaining Dark Mode.

Kingdom Hearts II

 * Riku has Dark Aura as a default ability.

Kingdom Hearts
While possessed by Ansem, Seeker of Darkness, Riku uses the first form of Dark Aura as his strongest technique.

Kingdom Hearts 358/2 Days
During his final battle with Roxas at The World That Never Was, Riku uses the first form of Dark Aura, but does not have to enter Dark Mode.

Kingdom Hearts: Chain of Memories
As he was created from the real Riku's combat data, the Riku Replica can utilize Dark Aura along with Riku's other skills granted by Dark Mode. Unlike Riku, who needs a card value of 27 to perform this attack, the Riku Replica can use it with any value. However, he does not start to use this attack until the final battles with Sora in the main story and Riku in Reverse/Rebirth.