I finally managed it last night without a Ghorn, with primary burn it's pretty easy provided you keep track of the captains and rotate when needed. Once the first set of mines are sorted your basically home dry, just keep calm and communicate. Get his health down to around the K in skolas, clear adds, rotate to the left platform with the broken wing as its slope. Wait for skolas to reach the middle of the arena, pass the taint then pop weapons of light and nuke the -blam!- out of him with all rockets. Adds will de spawn then you can quickly swap the taint if it's still there and split up to handle mines.

See I was thinking it wouldn't be bad week to try it with the primary burn. All the modifiers didn't seem that bad this week although I found out that arc burn for the cabal is ridiculous with the psions. I'm not in ps4 anymore but I appreciate the tips. Maybe next time I'll get to the last round. I mean I felt like I was doing alright but we seemed to never rotate as a group on round 4. I just don't wanna do the cabal round again haha

A good tip for round four is to leave a red bar enemy alive, have a Titan with blinding helm on and all go to the door the VIP spawns at, kill the add to start wave 2/3 then use blinding bubble on the door. Make sure to have arc shotties equipped and kill him quick then you can retreat back to your nomal spot.

I just celestial nighthawk that sucker lol. Kill him in one hit