Dark Aura

Dark Aura is one of Riku's abilities. They come in two different ways. The first Dark Aura is teleporting around the battle field with his weapon in front of him and ending by landing on the ground with a hard slam that creates a shockwave. This ability is first seen in Kingdom Hearts. His second Dark Aura is shooting a barrage of dark energy orbs at his opponents. The second version of Dark Aura is not to be confused with the previous versions with the same name from Kingdom Hearts or Kingdom Hearts II.

Kingdom Hearts: Chain of Memories
Riku rush enemies repeatedly with blade in hand. It finish off by stabbing the Soul Eater into the ground for a column of light that confuses the enemy. It is only avaliable in Dark Mode

This is the Attack Card requeriment for Dark Aura

Trivia

 * The Dark Aura in Kingdom Hearts II is very similar to Dark Firaga from the previous games.