It's an assault item that you get within the assault (meaning, you get this from a ??? Axe). You get it from Ilrusi Atoll Sergeant rank. Mission name is Apkallu Seizure.
Not sure exactly which assault this comes from, but I was told by a Japanese player who was wearing one, that it was from Assault; Sergeant rank. Which narrows it down
ERIK WANTS NOW Sorry lol my WAR is 60 and im gonna get it up there and this is a nice axe to use, and it's MY axe D: Please tell me how to get if ya know :D! Ty