Drain

Drain (ドレイン) is an ability that appears in Kingdom Hearts: Chain of Memories, Kingdom Hearts Birth by Sleep, Kingdom Hearts Re:coded, and Kingdom Hearts 3D: Dream Drop Distance. It allows the user to absorb HP when attacking enemies.

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 a Dimension Link ability that allows the user to drain HP with every attack that strikes an enemy.

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 Spirit support magic that allows the user to drain HP when striking enemies with basic attacks.

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

 * The has Drain as its level 2 ability.

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

 * Aura Lion learns Drain in Level 19 while in the Lionheart or Clear Mind disposition.
 * Chef Kyroo learns Drain in Level 15 while in the Patissier or Pyromanger disposition.
 * Escarglow learns Drain in Level 9 while in the Snail Support disposition.
 * Ghostabocky learns Drain in Level 4 while in the Phantom or Shaman disposition.
 * Keeba Tiger learns Drain in Level 15 while in the Usurper or Cruel Mind disposition.
 * Komory Bat learns Drain in Level 8 while in the Rescuer disposition.
 * Majik Lapin learns Drain in Level 17 while in the Spark Jockey or Illusionist disposition.
 * Peepsta Hoo learns Drain in Level 12 while in the Patroller disposition.
 * Tama Sheep learns Drain in Level 13 while in the Pillow Fluffer disposition.
 * Woeflower learns Drain in Level 15 while in the Meddler or Natural disposition.

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.