Elixir

The Elixir is a rare healing item that recurs throughout the  series. It can typically be used in battle to fully restore HP and MP to the user, or to a target of the user's choosing.

Mechanics
In Kingdom Hearts, Kingdom Hearts II, and Kingdom Hearts III, an Elixir fully restores the HP and MP of one party member.

In Kingdom Hearts Chain of Memories, Elixir is an item card that instantly restores all attack cards and magic cards that have been used, including those lost through sleights.

In Kingdom Hearts 358/2 Days, Elixir is an item panel that fully restores the user's HP and all casts of magic installed by the user.

In Kingdom Hearts Birth by Sleep, Elixir is an that fully restores the user's HP and Focus Gauge and eliminates any negative status effects. One slot in the Command Deck can hold two Elixirs.

In Kingdom Hearts Re:coded, Elixir is an that fully restores Data-Sora's HP and eliminates any negative status effects. One slot in the Command Deck can hold two Elixirs, with a memory consumption of 10%.

In Kingdom Hearts 3D: Dream Drop Distance, Elixir is an that fully restores the HP of all party members, charges all Link Gauges, and eliminates any negative status effects. One slot in the Command Deck can hold two Elixirs. In Flick Rush, Elixir is an evolved command that restores some HP to all of the party and completely refills their cards.

Kingdom Hearts

 * Elixir: Defender (1%), Wyvern (0.5%)

Kingdom Hearts II

 * Elixir: Devastator (5%), Living Bone (5%)

Kingdom Hearts Birth By Sleep

 * Elixir: Wild Bruiser (5%)

Kingdom Hearts

 * Elixir: Striking the cabinet in Pooh's Room, Chest in the Red Room, Chest in Final Dimension, Chest in World Terminus.

Kingdom Hearts II

 * Elixir: Chest at the Mansion: Foyer; chest at the Crystal Fissure.

Kingdom Hearts Birth by Sleep

 * Elixir (Terra): Chest at the Mermaid Lagoon; chest at the Seat of War.
 * Elixir (Ventus): Chest at the Mermaid Lagoon; chest at the Seat of War; chest at the Twister Trench.
 * Elixir (Aqua): Chest at the Mermaid Lagoon; chest at Peter's Hideout; chest at the Seat of War.

Kingdom Hearts 358/2 Days

 * Elixir: Chest at the Cave/Entrance Hall during Mission 48; chest in the Undercroft, The East Wing, The West Wing, and the Entrance Hall Upper Level during Mission 83.

Kingdom Hearts 3D: Dream Drop Distance

 * Elixir (Sora): Chest at the Mysterious Tower; chest at the Cloudwalk; chest at the Avenue to Dreams; chest at the Contorted City.
 * Elixir (Riku): Chest at the Golden Wood; two chests at the Delusive Beginning; chest at the Fact within Fiction; two chests at the Verge of Chaos.

Kingdom Hearts III

 * Elixir: Chest at the Corridors, chest at Andy's House, chest at the Gorge, chest at the Seaport, chest at the North District.

Kingdom Hearts

 * Elixirs can occasionally be found by picking pumpkins and cabbage at Rabbit's House.

Kingdom Hearts Chain of Memories

 * Finding Roo in his hole causes him to give Sora an Elixir.

Kingdom Hearts 3D: Dream Drop Distance

 * Sora and Riku can purchase an Elixir from the Ducky Goose Ability Link for 50 Link Points.
 * Meow Wow can use Elixir as its evolved command.
 * Me Me Bunny can use Elixir as its evolved command.
 * Ducky Goose can use Elixir as its evolved command.
 * Frootz Cat can use Elixir as its evolved command.

Kingdom Hearts III

 * Can be purchased at Moogle Shops for 4000 munny after obtaining the M.O.G. Card.

Etymology
s are recurring items in the  series. In most of its appearances, the Elixir completely restores HP and MP for one character.