Before entering the boss area, you'll find yourself in a section full of weapons. There are:
1. MGs
2. SMGs
3. Shotguns
4. Rocket Launchers


Pick accordingly to your playstyle, but the cheesiest method to is to go rockets or snipers (it's not in this section, but you can find them from enemy drops before you entered here)


Just before you start the fight, you can see there are 6 power ups, 3 rows of 2 of them.

From the front, you will have AimBuff, Armor, and DamageBuff. Plan when to pick them up accordingly.

This boss has 2 phases:
1. The first phase where it shoots
2. The second phase where it summons enemies

The First Phase
The first phase consists of the boss shooting a variety of projectiles that are very hard to dodge at close range.



Best thing to do is wait for an opening (ie, when it's shooting the big projectiles that are few or the laser beam one) and go in to deal damage. But if you insist on fighting close range, be sure to use shield and dashes alot.


The Second Phase
The second phase will have the boss using its camo, invulnerable to damage. It will summon waves of mobs for you fight which is pretty straightforward.


After the waves are cleared, the boss will deactivate its camo and you can damage it again. This goes on for every quarter of health the boss loses, just rinse-repeat.