Crescent Unit Quartus is an enemy from Crisis Core -Final Fantasy VII-.
He uses the Anesthetic Missile attack and the Curaga spell that are shared among the Crescent Unit enemies, in addition to his own skill, Triple Trouble, which inflicts major damage to Zack's MP. Despite his high HP, the player can simply hammer away at the enemy with regular attacks if he is alone.
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Etymology
Quartus is Latin for "fourth".