Crescent Unit Nomen is an enemy from Crisis Core -Final Fantasy VII-.
Nomen is a bit more difficult than other Crescent Units, as he is far more agile than them so attacking from behind is going to be more difficult. However, much like other Crescent Units, he has low Spirit so abusing magic against him is advisable. Also of note is to bring Fire-elemental protection as he has access to the powerful Tri-Fire spell.
Nomen is Latin for "name."