The Devils Lair
Epic - enemies are heavily shielded and highly aggressive in great numbers
Lightswitch - you get one shotted by melee attacks
Juggler - no ammo drops for equipped weapon, use those Ice Breakers!
Void Burn - void weapons do extra damage
Nightfall - If all players die you return to orbit and start over
Cheese spots:
During the hacking wave, go to the left, where the tanker is, and take pot shots from there, retreat if your health is low, enemies cannot follow you in there with maybe the exception of Thralls, let the fallen and hive fight each other

Devil Walker: Go the far back left and shoot at his legs with a void sniper for massive damage, adds can't touch you and only the devil walkers cannon can really hit you

Sepiks Prime: The room to the left of the entrance, hide in there and shoot away, be careful if you go downstairs to try to get another angle on sepiks as there are likely fallen majors down there waiting for you