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 ultilizes the power of darkness, and is often used by Riku. Its primary form consists of Riku using dark portals to repeatedly rush across the field of battle at high speeds, while cloaked in an aura of darkness, and finishing with a slam to the ground to summon columns of light. There is a variation used only in Kingdom Hearts II that somewhat resembles Dark Firaga.

Mechanics
In Kingdom Hearts: Chain of Memories, Dark Aura is an Attack Sleight that can used by Riku while in Dark Mode. It may confuse enemies.

In Kingdom Hearts II, Dark Aura is an Action Ability that can be equipped by Riku. It allows Riku to fire orbs of dark fire near the end of Sora's attack combo, when the prompted Dark Aura Reaction Command is used. It can stop enemies on contact. It costs 2 AP to equip and 10 MP to use.

Additionally, during the final battle with Xemnas, while Riku is being controlled by the player, this version of Dark Aura can used by pressing.

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 Dark Aura as his strongest technique.

Kingdom Hearts 358/2 Days
In the later stages of his final battle with Roxas at The World That Never Was, Riku uses Dark Aura without needing to be in Dark Mode.

Kingdom Hearts: Chain of Memories
As a Replica 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.

Kingdom Hearts: Re:coded
During the third and final battle with Data-Riku in Hollow Bastion, he can utilize Dark Aura at random times.

Kingdom Hearts 3D: Dream Drop Distance
Riku will be able to use Dark Aura as a command.