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.

Kingdom Hearts: Chain of Memories

 * The Search Ghost card has Drain as its effect.

Kingdom Hearts Birth by Sleep

 * The Maleficent Dimension Link has Drain as its level 2 ability.

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.