Quake

Quake is a technique exclusive to Terra in Kingdom Hearts Birth by Sleep, Sora in Kingdom Hearts: Chain of Memories, and to Data Sora in Kingdom Hearts Re:coded.

Mechanics
In Kingdom Hearts Re:Chain of Memories Quake is a sleight, activated by combining a Gravity Card, a Simba Card, and any Magic Card. Sora spins his Keyblade and smashes it into the ground, creating a strong shockwave that badly injures the enemies.

In Kingdom Hearts Birth by Sleep, Quake is an Ultimate Attack Command that takes up two slots in the Command Deck, has a maximum level of 5, and a normal reload time of 20 seconds. When used, Terra thrusts his Keyblade into the air as he commands a small portion of earth around him to violently jut up, heavily damaging enemies in a wide area.

In Kingdom Hearts Re:coded, Data Sora jumps up into the air and then slams down the ground, damaging nearby ground enemies. It takes up 15% of memory.

Kingdom Hearts Birth by Sleep

 * It can be bought from the Moogle Shop for 2500 munny once the command has already been obtained elsewhere.

Kingdom Hearts Birth by Sleep

 * The first recipe has a 30% success rate.
 * Brutal Blast (LV4) + Brutal Blast (LV4)
 * The second recipe has a 90% success rate.
 * Brutal Blast (LV4) + Magnega (LV4)
 * The third recipe has a 30% success rate.
 * Mine Square (LV3) + Binding Strike (LV3)
 * The fourth recipe has a 30% success rate.
 * Stun Edge (LV3) + Mine Shield (LV3)
 * The fifth recipe has a 90% success rate.
 * Zero Graviga (LV4) + Brutal Blast (LV4)

Kingdom Hearts Re:coded

 * Zantetsuken + Cyclone

Origin
Quake is a recurring Black Magic spell in the Final Fantasy series. It usually deals earth-elemental damage to one or all opponents, and may not affect flying enemies, depending on the game.