Bring an auto rifle for the oracles it is much easier to kill them with fast shooting weapons. For the entrance only put people on the left and right side that will make it so praetorians only occasionally go to the center but be sure to watch for the ones that do, you can see them from the sides. one last thing for the Templar boss fight get everyone to go to the farthest pillar floating on the left only the Templar can hit you there and the relic user can cleanse everyone easily.