I couldn't finish 'em. Looks like this's gonna get complicated.
Crescent Unit Tertius is an enemy from Crisis Core -Final Fantasy VII-.
Crescent Unit Tertius access to the Anesthetic Missile attack and Curaga spell that are shared amongst the Crescent Unit enemies, in addition to its own skills Jagged Edge, which deals high non-elemental physical damage, and Pain Plunge, which reduces Zack's HP to 1. Despite his high HP, the player can simply hammer away at the enemy with regular attacks to defeat it if it is alone.
Tertius is Latin for "third."