Hi-Ether

The Hi-Ether is recurring item that was introduced in Kingdom Hearts 358/2 Days. It can typically be used in battle to restore a large amount of MP to the user, or to a target of the user's choosing.

Mechanics
In Kingdom Hearts 358/2 Days, Hi-Ether is an item panel which restores two casts of each type of magic installed.

In Kingdom Hearts Re:coded, Hi-Ether is an that raises Data-Sora's Clock level by two. One slot in the Command Deck can hold two Hi-Ethers, with a memory consumption of 12%.

In Kingdom Hearts III, a Hi-Ether completely restores the MP bar, even under MP Charge.

Kingdom Hearts 358/2 Days
The Hi-Ether can be synthesized for 1200 munny once Roxas is promoted to Novice rank.
 * 2 Ether

Kingdom Hearts III
Hi-Ether can be synthesized once 12 different synthesis materials are obtained.
 * 3 Wellspring Stone
 * 3 Lightning Stone
 * 3 Writhing Stone
 * 1 Hungry Shard

Kingdom Hearts 358/2 Days

 * Hi-Ether: A chest in the Lotus Forest during Mission 67; a chest at the Agrabah Gate during Mission 68; a chest in the Bizzare Room during Mission 69; two chests at the Halloween Town Square and Boneyard 2 during Mission 79; a chest in the Sandswept Ruins during Mission 82; a chest on the Bridge during Mission 83; three chests in the Underground Passage, the Side Street, and at Tram Common during Mission 89.

Kingdom Hearts III

 * Hi-Ether: Chest in Mountainside, chest in Babies & Toddlers: Outdoors, chest in Wildflower Clearing, chest in Valley of Ice, chest in Central District.

Kingdom Hearts III

 * Hi-Ether: Phantom Ship fleet (100%)

Development
Hi-Ethers were planned to appear in Kingdom Hearts II, and had a sprite developed, but were ultimately left out of the finished game.