You don't need a cheese you need a strategy. First off you can blind the tormentors, freeze them, and suspend them. Use this to your advantage as much as you can. Got a weapon with chill clip? Use it! Got a nade launcher with blinding nades? USE IT. next you need an exotic heavy. Thunderlord with catalyst or two tailed fox with catalyst or sleeper with catalyst or something good... Like anarchy witherhoard some form of meta dps option as an exotic. Next you need a plan. Hit Calus hard in the beginning clear the adds on the pad you spawn in on and when he goes to bomb it jump to the catwalks after he bombs it go back to platform clear adds and fight tormentor. Slow him down blind him freeze him ECT. Have two players you don't need three it makes it way hard. Both of you take out the first tormentor, then proceed to damage Calus run to catwalk run back clear adds kill second tormentor kill Calus from here it's just running around and avoiding Calus axes to the face while pumping whatever ammo and abilities you have left into him until he dies. Good luck buddy.