BO PRIME BLUEPRINT TOWER II MOBILE DEFENSE    
BO PRIME HANDLE TOWER IV EXTERMINATE          
BO PRIME ORNAMENT TOWER I SURVIVAL

So to get the T4 ext keys, you need to do an interception mission to round 3 (leave at 3 if it dont drop, gets stuck in a mod loop after that atm), looking for a mission with enemys staring levels to be between 10-19 for the ext key, over 20 and they drop survival, defence or interception T4 keys which is no good for this weapon.

the most work for this has to be the handle, the T4 ext mission itself not so much. even vor turning up is easy over the hastle of finding a T4 ext key to begin with.

Lucky for us we managed to get it in only afew trys with a nice farming team but after farming all the other prime stuff inthe game, trust me when i say that some prime items can be a pain! a month of T3 survival for the glaive is something i will never do again.

But once you have the parts and build this its great, the introduction of melee 2.0 and the stance mods means all new melee weapons at unranked can have 10 points to fit in pressure point so you can start with a nice damaging weapon from the moment you get it.

this even looked nice with nice stance mods.

to be fair, the weapon is really nice, the damage is nice and the 2 polaritys mean you dont have to forma this. with a catalyst in and 70 total points (60 from leveling, 10 from stance mod) i have 1 point left on this and its working great.

Swings really quick too, so only down side i can find is that T4 ext key hunt lol.