Cooler Leech refers to a series of four bosses from Final Fantasy IV: The After Years. They are part of the boss Cooler Mammoth, and form his tentacles. The Cooler Leeches can cast Blizzara and can buff the Cooler Mammoth with Shell. If the Leeches are killed, the Cooler Mammoth will regenerate them. The easiest way to deal with them is to have Porom group-cast Silence on them, disabling their spells so they can only use physical attacks. A subsequent group-cast of Slow will cripple them further, drastically reducing the difficulty of the fight.