Gravity

Gravity (グラビデ), Gravira (グラビラ), and Graviga (グラビガ) are spells which appear in Kingdom Hearts and Kingdom Hearts: Chain of Memories. They utilize the "power of the stars", and are associated with the Lucid material. Gravity spells form a miniature event-horizon that crushes their target, reducing their HP by a set fraction and rendering them temporarily defenseless to further attacks.

Zero Gravity (ゼログラビデ), Zero Gravira (ゼログラビラ), and Zero Graviga (ゼログラビガ) are spells which appear in Kingdom Hearts Birth by Sleep. They function much like the Gravity spells, but instead of crushing the opponent, they fling them into the air, where they slowly lose HP and may become Confused.

Kingdom Hearts
Sora and Donald Duck can obtain each type of Gravity spell, but can only cast the most powerful version they possess. Genie can use Gravira by default, however, and Jack Skellington's "Ghostly Scream" is his personal version of Gravity. Wizard Heartless also use the Gravity spell.

The fraction of HP depleted by Gravity is based on Sora's magic strength, and it is possible to deal 100% damage if the spell isn't resisted by its target. However, after Kairi's rescue, all enemies resist the spell enough so that instant kills are not possible. The Gravity spell is also used to lower certain treasure chests at Hollow Bastion.

Kingdom Hearts: Chain of Memories
As in Kingdom Hearts, Sora can cast the Gravity spells. Genie can still cast Gravira, while Jack can cast Gravity, Gravira, or Graviga, depending on which Sleight he is summoned with. Wizard Heartless can still cast Gravity, as well.

The Gravity card can be used for many Sleights in Kingdom Hearts: Chain of Memories, all of which involve spatial manipulation or suction.

As a magic card, Gravity can also be used within the following sleights.

Kingdom Hearts

 * Sora and Donald obtain a Gravity element after locking the Keyhole at Halloween Town.
 * Sora and Donald obtain a Gravity element after completing the Phil Cup.
 * Sora and Donald obtain a Gravity element after defeating Hades in the Hades Cup.

Kingdom Hearts: Chain of Memories

 * The Gravity card is the Agrabah Bounty.
 * Sora learns "Gravira" and "Graviga" after obtaining a Gravity card.

Kingdom Hearts Birth by Sleep

 * Terra, Ventus, and Aqua can obtain each type of Zero Gravity spell.

Kingdom Hearts Birth By Sleep

 * Tank Toppler: 25%(Zero Gravity, Zero Gravira) 5%(Zero Graviga)

Recipes
Zero Gravira-Aero (LVL 2) and Magnet (LVL 2)-90%
 * Thunder LVL 2) and Zero Gravity (LVL 2)-90%
 * Zero Gravity (LVL 2) and Zero Gravity (LVL 3)-90%

Zero Graviga-Thundara (LVL 3) and Zero Gravira (LVL 3)-80%
 * Zero Gravira (LVL 3) and Zero Gravira (LVL 3)-80%
 * Zero Gravity (LVL 3) and Zero Gravira (LVL 3)-80%

Melded commands
Gravité