AquaCut is an ability that has so far only appeared in some of the Dragon Quest Monsters games. It does 50% damage to Water family enemies and costs 3 MP.

Dragon Quest Monsters 2

AquaCut requires the monster to reach Level 12 with 68 HP, 72 Attack and 62 Agility. It is naturally learned by the CaptDead, Garudian and LizardMan