when entering the final room, have the strongest most unkillable guardian in your fireteam learn the rat maze and take out the minotaurs. the other two people can clear a few enemies in the entry hallway and wait. have a well or a bubble, and div, use precision weapons and double special. an example would be thunderlord and two snipers, or retrofit lmg with eriana vow and a sniper or a chillclip fusion rifle could come in handy too. one person with chillclip is all that is needed to get some additional shatter dmg if needed. The reason you want to dps from the entry hallway is it is relatively clear from enemies, and if the boss pushes up on you, simply back up beside the walls with the hole that you can crouch under, and the boss will decide not to push up on you. so it creates a special place in the area where you can have constant uninterrupted dps, and it can begin as soon as the three buffs are collected and before the 1 fireteam member returns to the location.