Dark Break

Dark Break (ダークブレイク) is an ability exclusive to Riku that appears throughout the Kingdom Hearts series. It consists of him leaping into the air and attacking enemies from above several times.

Mechanics
In Kingdom Hearts: Chain of Memories, Dark Break is an Attack Sleight that Riku can access while in Dark Mode. To use Dark Break, Riku must stock three cards with a value of 5 through 15. While Dark Break is automatically excecuted completely in the original Kingdom Hearts: Chain of Memories, in its remake, the player must press whenever the symbol appears on the screen to add additional attacks to the Sleight.

In Kingdom Hearts 3D: Dream Drop Distance, Dark Break is a command exclusive to Riku. As in past games, it consists of him leaping into the air and attacking enemies from above several times. It takes up one slot in the Command Deck, and has a reload time of 22 seconds.

Kingdom Hearts: Chain of Memories

 * Riku learns Dark Break after he gains the ability to enter Dark Mode.

Kingdom Hearts 3D: Dream Drop Distance

 * Riku can obtain Dark Break from Fishboné's Ability Link.

Other appearances
Riku is fought several times as a boss throughout the Kingdom Hearts series. Dark Break serves as one of his weaker desperation attacks in each of these encounters.

Kingdom Hearts
When Sora faces Riku for the second time while Riku is under the possession of Ansem, Seeker of Darkness in Hollow Bastion, Riku utilizes an unnamed variation of Dark Break throughout the battle that consists of him leaping into the air and plunging the Keyblade of People's Hearts into the ground a single time to hit Sora with several columns of dark flame.

Kingdom Hearts Re:Chain of Memories
While he does not have access to it in the original Kingdom Hearts: Chain of Memories, the Riku Replica can execute a variation of Dark Break known as "Helm Split" from his second battle onward against Sora and in both of his battles against Riku in Kingdom Hearts Re:Chain of Memories. The attack is based slightly on the Kingdom Hearts variation of Dark Break, as after the Riku Replica strikes his target from above, he concludes the Sleight by hitting Sora or Riku from below with several columns of dark flame.

Kingdom Hearts 358/2 Days
During his battle with Roxas in The World That Never Was, Riku is able to use an unnamed variation of Dark Break once the Oblivion Keyblade he wields starts to glow with blue energy. This version of Dark Break has a teleportation element which allows Riku to follow Roxas around the battlefield while executing his aerial strikes. The attack concludes with several columns of dark flame erupting around Riku.

Kingdom Hearts Re:coded
Data-Riku can use Dark Break at any time during the final phases of his battle against Data-Sora in Hollow Bastion. The attack only consists of one aerial strike, after which Data-Riku sends several Bug Blox flying in Data-Sora's direction.