Sonic Blade

Sonic Blade (ソニックレイヴ) is an ability that appears in Kingdom Hearts, Kingdom Hearts: Chain of Memories, Kingdom Hearts II, Kingdom Hearts 358/2 Days and Kingdom Hearts Birth by Sleep. Sonic Blade is a technique that lets the user execute a number of successive thrusting attacks. After the first attack, execute each successive attack by using the prompted command.

Mechanics
In Kingdom Hearts and Kingdom Hearts Final Mix, selecting Sonic Blade from the last command box activates the first attack, and if it connects, the command box will change to Rave. Selecting Rave executes the next attack in the sequence. Rave appears five times, if all the attacks connect, and is then replaced with Blast, which executes the powerful finishing thrust. It costs 3 AP and 2 MP bars to equip.

In Kingdom Hearts: Chain of Memories, pressing at the end of each thrust executes the next, for up to six additional attacks.

In Kingdom Hearts: Re:Chain of Memories, each attack after the initial thrust is activated by pressing at the prompt, for up to six additional attacks.

In Kingdom Hearts II Final Mix it is only available while using Limit Form, selecting Sonic Blade from the Limit menu with activates the first attack, and using the Rave Reaction Command executes the next attack in the sequence. Rave appears five times, and it is then replaced by the Finish Reaction command, which executes the final attack. It costs 60 MP to use.

In Kingdom Hearts Birth by Sleep, Sonic Blade is an Ultimate attack command that takes up one slot in the Command Deck, has a maximum level of 5, has a normal reload time of 15 seconds, and fills the Command Gauge by 20%.

Kingdom Hearts and Kingdom Hearts Final Mix

 * Sora learns Sonic Blade after defeating Cerberus at Olympus Coliseum.

Kingdom Hearts: Chain of Memories

 * Sonic Blade is an Attack Sleight that can be learned when Sora reaches level 22.
 * Its card combination is:

Kingdom Hearts Re:Chain of Memories

 * Sonic Blade is an Attack Sleight that can be learned when Sora reaches level 27.
 * Its card combination is:

Kingdom Hearts II Final Mix

 * Limit Form has Sonic Blade as a default ability accessible from the Limit menu.

Kingdom Hearts Birth by Sleep

 * Terra, Ventus, and Aqua can create Sonic Blade through Command Melding.
 * Terra, Ventus, and Aqua can purchase Sonic Blade from the Command Shop for 2000 munny the command has already been obtained elsewhere.
 * Terra, Ventus, and Aqua can obtain Sonic Blade as the first reward for beating Hercules in the Break the urns mini-game.
 * The Terra D-Link has Sonic Blade in its Lv.2 Command Deck.
 * The Goofy D-Link has Sonic Blade in its Lv.2 Command Deck.

Kingdom Hearts Birth by Sleep
Sonic Blade is an Ultimate-class Attack Command that can be melded through three different recipes, listed in the Giga Attack Recipe.
 * The first recipe can be melded by Terra, Ventus, Aqua, and is a recipe that has a 10% chance of transforming into Lightning Ray when melded.
 * Air Slide (LV4) and Blitz (LV4)
 * The second recipe can only be melded by Terra, and is a recipe that has a 10% chance of transforming into Lightning Ray when Terra melds it.
 * Dark Haze (LV4) and Blitz (LV4)
 * The third recipe can be melded by Terra, Ventus, Aqua, and is a recipe that has a 10% chance of transforming into Lightning Ray when melded.
 * Thunder Surge (LV4) and Fire Dash (LV4)

Kingdom Hearts and Kingdom Hearts Final Mix
Cloud uses a powerful version of Sonic Blade as one of his special attacks.

Kingdom Hearts II
Genie's Limit when he is in Valor Form is called Sonic Rave. The technique transforms Genie into a giant fist and Sora slams him into the ground repeatedly.

Kingdom Hearts 358/2 Days
Although Sonic Blade cannot be performed by any playable character, Xion in her First Form can perform a midair three-strike Sonic Blade and will only stop when any part of it misses or gets blocked.

Trivia

 * Like some of Sephiroth's attacks in Kingdom Hearts, the Sonic Blade attack makes an appearance in Dissidia Final Fantasy as one of Cloud's Brave attacks.