Drain

Drain (ドレイン) is an ability introduced in Kingdom Hearts Chain of Memories. It allows the user to grant the status to allies or themselves.

Mechanics
In Kingdom Hearts Chain of Memories, Drain is an enemy card effect that allows Sora to regain HP when striking enemies with attack cards, in exchange for enemies dropping fewer items. It costs 35 CP to add to the deck and lasts for one reload.

In Kingdom Hearts Birth by Sleep, Drain is an ability that restores the user's HP by 1/4 of the damage dealt with regular attacks.

In Kingdom Hearts Re:coded, Drain is an Overclock ability that allows Data-Sora to recover HP when striking enemies with basic attacks.

In Kingdom Hearts 3D: Dream Drop Distance, Drain is a magic command that gives one ally the Drain status for 10 seconds. b° 0° 0° 0° 0° 0° 0° 0° 0° 0° 0° c°

Kingdom Hearts Chain of Memories

 * The Search Ghost enemy card has Drain as its effect.
 * The Black Fungus enemy card can randomly activate Drain.
 * The Darkside enemy card can mimic an enemy's Drain.

Kingdom Hearts Birth by Sleep

 * Maleficent's D-Link learns Drain after collecting 2 emblems.

Kingdom Hearts Re:coded

 * The Metal Chocobo: Ag and its upgrades have Drain as a level MAX Clock Ability.
 * The Ultima Weapon 〉〉〉 and its upgrades have Drain as a level MAX Clock Ability.

Kingdom Hearts 3D: Dream Drop Distance

 * Tama Sheep learns Drain at Level 13.
 * Komory Bat learns Drain at Level 8.
 * Peepsta Hoo learns Drain at Level 12.
 * Escarglow learns Drain at Level 9.
 * Ghostabocky learns Drain at Level 4.
 * Chef Kyroo learns Drain at Level 15.
 * Woeflower learns Drain at Level 15.
 * Majik Lapin learns Drain at Level 17.
 * Aura Lion learns Drain at Level 19.
 * Keeba Tiger learns Drain at Level 15.

Etymology
is a recurring Black Magic spell in the  series. It absorbs HP from the target to refill the caster's HP.

There are weapons and abilities in the Final Fantasy series with similar effects to Drain in Kingdom Hearts, such as.