
Originally Posted by
cfStatic
I did this last night with an AR and a BMG.
In the first phase when, after he does his blur dashes(3-5 in total or something), there is a very small window where you can lay into him. Just run/roll out of the way when he does that and rinse/repeat till you're done with phase one. I'd recommend just watching him after the dashes for a couple times to so you get used to him dashing, but also so you can get the timing for the window in which you can attack down(he'll kneel, but it's only for like 1-2 seconds). Make sure to use the BMG to heal yourself if you get hit. Also, a good trick when he fires the 3 larger projectiles at you is to strafe sideways for a step or two and then roll in that same direction, you'll avoid all the damage.
The second phase: He/his clones always spawn on the same side of the room(or maybe it's the opposing side of whatever side you're on), take them out as quickly as you can. You'll eventually hit him and deal some damage. When he goes up top to do that knife throwing attack, start shooting the clones to lessen the amount of projectiles. If you're lucky, you'll actually hit him and you'll cause him to abort that attack. Rinse/repeat until phase 3.
Phase 3 is the easiest IMO but also the one that is most likely to get you killed. When he goes into the core, look around and find where the floor is lightning up, don't stand there. Shoot the crystals to break them. Also, make sure you stand by one the pillars in the room. When he does his jump/slam move, stand on the opposite side to avoid the damage. After he lands start shooting him in the face until he teleports to you, then just go around to the other side of the pillar and do it again. Every so often he'll summon more crystals. Be warned btw, when he smashes the ground, whatever crystals are there will break/explode, so you could potentially take a lot of damage(it might be enough to kill you outright if you get hit with the slam+crystal).
Good luck.