Drain

Drain is an ability found in Kingdom Hearts: Chain of Memories, Kingdom Hearts Re:Chain of Memories, and Kingdom Hearts Birth by Sleep.

Kingdom Hearts: Chain of Memories and Kingdom Hearts Re:Chain of Memories
The Drain ability is found in Search Ghost's Enemy Card, it drains the enemy's HP for every attack cards used. But using the ability will decrease items drop rate.

Kingdom Hearts Birth by Sleep
The Drain ability is used as Maleficent's Dimension Link's secondary effect. It drains enemy's HP for every type of attack used.