Ok I'll give everyone my strat. 100% works if you have the skill. Don't aim for phogoth. After 3 drop ships of hive no more come. So chuck grenades when they drop, take them out so it's just your FireTeam and phogoth. Phogoth is easy when he's by himself. He's slow. His reaction timing is slow. Pop up and shoot at different places with weapons that do a lot of damage and nobody will die and he will die quickly. I usually stay to the left. Right side is terrible, enemies retreat there. Staying back is maybe worse than cancer. Shriekers spawn, all enemies from all sides rush in there if you stay back. If you run this correctly, the battle should be 10 minutes.