Drain

Drain (ドレイン) is an ability found in Kingdom Hearts: Chain of Memories, Kingdom Hearts Re:Chain of Memories, Kingdom Hearts Birth by Sleep, and Kingdom Hearts Re:coded. In Kingdom Hearts: Chain of Memories and Kingdom Hearts Re:Chain of Memories, it allows Sora to regain HP while depleting enemies's HP for every attack card used, but using the ability will decrease items drop rate. In Kingdom Hearts Birth by Sleep, it appears as a level 2 Dimension Link effect, and drains enemies's HP for every type of attack used. In Kingdom Hearts Re:coded, it appears as an Overclock ability that allows Data-Sora to recover HP when he hits enemies with his basic attacks.

Kingdom Hearts: Chain of Memories and Kingdom Hearts Re:Chain of Memories

 * Sora gains the Drain ability by using the Search Ghost enemy card.

Kingdom Hearts Birth by Sleep

 * [[File:DL Sprite Maleficent Ability 2 KHBBS.png]] Drain is the level 2 ability for the Maleficent Dimension Link.

Kingdom Hearts Re:coded

 * The Metal Chocobo: Ag and its upgrades have Drain as one of their level MAX Clock Abilities.
 * The Ultima Weapon 〉〉〉 and its upgrades have Drain as one of their level MAX Clock Abilities.

Etymology
Drain is a recurring spell in the Final Fantasy series often involved with Black Magic.