Just posted this in another thread but here ya go, my teams strategy... 1. Rush past all adds down low (do not shoot the knights) and have 5 people go left and one person go right. 2. The 5 person team will end up aggroing all the adds and pulling them to the lower left side of the map. 3. Quickly kill the wizard and the shrieker on the left and then gtfo. 4. The right person will only have 1 knight to watch out for in the beginning, so run in shoot the glass and aggro the wizard. 5. Run out, take cover and kill this wizard. 6. Once both wizards are dead have all the team rush right and kill the knights and acolytes inside the room, because all outside adds are on the left side and will not attack you. 7. You can run into the room and jump above the doors in the crystal room, this keeps most adds from dealing you damage and you can get a start on the Death Singer while your team kills the adds. 8. Suppression grenades work great against the Death Singer, it stops her from shooting for a short time.