Originally Posted by
Sanguinesun
1. Have a BMG equipped.
2. Have defense centric and explosion and or overcharge perks set(this is just one set up many many others work too).
3. Have a sticky delayed or large radius or ground pounder style detonator equiped.
4. Have either a pyro, frag, or split frag(detonates into multiple smaller ones) grenade.
5. Be so comfortable with dodge and sprint running that they are second nature.
6. Have a 1300 range shield with a 40% charge or better.
7. Time your overcharge usage(if you go that perk route) for use in the third phase instead of the first or second since those are usually the easier phases imo.
First phase: This is a rather easy phase, you just time his runs and voice cues for his AI and detonate between your sprint and dodging out of the way. If you lose shield/health, flip to your bmg and heal up.
Second phase(where he splits into multiples for part of it): near the central pillar but on the opposite side of section that his clones spawn. Use the bmg offensively or the nader to damage him or the clones as needed.
Second phase(where he goes up top to throw the energy bolts at you): pick a side of the room and starting at the center bmg immediately the one near center pillar then move into the section of the room along the same side and bmg down 2 more(or just start on the second of the 3 and go from there). You're doing this to essentially clear a side where you can duck behind the far piller in that room and get hit by either none or just one of the bolts from the other clones. Once done set back up for the clones running around on the ground in the first part of the second phase.
Third phase first part: This I call the dodge rolling phase. Stick around the center pillar. Memorize his pattern of movement and sound cues(when he spins to do the aoe energy burst on the ground). Always make sure you're on the opposite side of the center pillar from that aoe. If you get hit with it, just bmg to heal up. Otherwise when he hits the ground, immediately swivel around the pillar after to lob nades from your detonator at him and be ready to run or dodge again. Be careful because currently he can also run straight through the pillar during this as a sort of dirty cheat. Again heal up if you get swiped from any of this.
Third phase second part: when he enters the spire's force field to put cause the crystals to shoot up through the ground, watch out for the spots they'll appear at(color on the floor changes). Stray a little bit from the center pillar but not too much. Once he's done with the crystal creating he does that really nasty aoe that the closer you are to him and other crystals, the more damage you take compoundedly. Therefore, do your best to run around one side of the room, then once he's done try to get to the other side around the curve, of the side of the room, this will usually cause you to take little to no damage if you can do it right.
However if you do take damage just bmg heal it.
Just rinse and repeat until he's dead with your use of overcharge as needed.
Overall this fight is really more about healing yourself and timing to avoid damage than the damage you do to him.
Hope this example helps. You can use other set ups too of course but this one's had the easier time of it for me.