Ragnarok

Ragnarok (ラグナロク) is a special technique introduced in Kingdom Hearts. It lets the user fire a cluster of energy bullets from the tip of their Keyblade.

Mechanics
In Kingdom Hearts, Ragnarok is a Special Ability. When close to an airborne enemy, selecting the Ragnarok command will cause Sora to automatically jump up to the enemy and deliver a aerial attack combo, after which he will hover while charging energy. Unlike Sonic Blade or Ars Arcanum, it requires no timing to execute the finisher, Impact; however, the longer Sora charges before using Impact, the more projectiles are fired and the heavier the damage, with the optimal time being immediately after the Keyblade releases a circular burst of light. The projectiles home in on enemies after being fired, while Sora can move freely. It costs 4 AP to equip and 3 MP to use. However, if Sora waits too long, the energy from the keyblade will fade and the attack will end without the finisher. Like with Ars Arcanum, Sora loses the attack invincibility during the followup command at the end, making it a risky ability to use at times.

In Kingdom Hearts: Chain of Memories, Ragnarok is an Attack Sleight. Pressing —  in Kingdom Hearts Re:Chain of Memories — fires the projectiles sooner, and there is no difference in damage. Though if the player waits too long, the sleight may be broken or Sora will automatically fire the attack, so the "charging" portion is meant to utilize a time to aim the attack properly. In Kingdom Hearts Re:Chain of Memories, the attack is now akin to its original version, only like in the original GBA only the final portion of the attack is used, and the rays home in on enemies like before.

In Kingdom Hearts II Final Mix, Ragnarok is an Action ability available while in Limit Form, either from the Limit menu or by pressing in the Shortcut menu. Using Ragnarok will trigger an aerial attack combo, followed by Sora charging energy while in the air. Selecting one of the Reaction Commands that appear, Shoot, Impact, or Giga Impact, will fire the charged projectiles. Waiting until Giga Impact before pressing will fire the most rays. The projectiles home in on enemies.

In Kingdom Hearts 358/2 Days, Ragnarok is Sora's Limit Break. The Final Limit version fires larger, faster shots that lose their homing ability but are propelled together in a drilling formation, piercing through enemy guards. For both, allowing it to charge before pressing will fire a larger number of projectiles.

In Kingdom Hearts Birth by Sleep, Ragnarok is a Shotlock that has a maximum level of 4 and max lock of 16. Once the attack has begun, the player can perform extra attacks by pressing at the right time to fire additional projectiles.

Kingdom Hearts

 * Sora learns Ragnarok after his second encounter with Riku, in Hollow Bastion.

Kingdom Hearts: Chain of Memories

 * Ragnarok is an Attack Sleight that can be learned when Sora reaches level 47.
 * Its card combination is:

Kingdom Hearts Re:Chain of Memories

 * Ragnarok is an Attack Sleight that can be learned when Sora reaches level 52.
 * Its card combination is:

Kingdom Hearts II Final Mix

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

Kingdom Hearts 358/2 Days

 * Sora's Limit Break is Ragnarok.

Kingdom Hearts Birth by Sleep

 * Terra, Ventus, and Aqua can purchase Ragnarok from a bonus panel on the normal Keyblade Board.

Kingdom Hearts 358/2 Days
Xion in her second form can use Ragnarok, where the streams of shot fires are long lasting and can chase the player around until its end, it can deplete the player's HP to the Alarm Zone, if not bringing the HP to zero. Ragnarok is considered a Nil-based attack in this game, it ignores defense completely.

Etymology
Ragnarök is an event in Norse mythology that is similar to the Apocalypse. It is an event that is set off by the death of the god Balder, which was orchestrated by Loki. The Ragnarok was a final clash of all the major entities of Norse mythology. This caused all of the human spirits up in Valhalla to come down for the final battle. This bloody encounter ebbs with the destruction of the universe and Balder along with a little handful of entities that are put in the bodies of children and only contain memories of the world before Ragnarok. Those entities would become mortal.

Ragnarok is also a reoccurring Summon and weapon that appears in various games in the Final Fantasy series. It also appears as an airship and a legendary beast.

Ragnarok