Blood Drain

Blood Drain is a Blue Mage spell action. This spell must be learned before players can pick up the quest Blue Collar Work.

Description
Through the draining of blood, this spell saps a foe's aether, a portion of which is then absorbed by the caster. In nature, such habits first appeared in creatures such as bats and chigoes, who naturalists theorize developed the ability to absorb nutrients via blood over the course of centuries.

Source
Blood Drain can be learned from one of the following mobs:
 * Black Bat - Sastasha, The Bramble Patch
 * Cave Bat - Blind Iron Mines
 * Chigoe - Greentear, Jadeite Thick
 * Sand Bat - The Dry Sands