the idea of bulwark is to stand to the sides with the tank on the stairs... when his shield goes up you click the boxes on each side. He will summon droids to repair those boxes that you originally destroyed... you have to kill or cc them or they will put up his immunity shield once more. Bulkwark has a cone aoe so only the tank must stand in front of him. If you stand too far away he will one shot you. The enrage timer is quite quick so you must not ever let his shield go up when the droids come out to repair. Hope that helps out a little bit. As for the boss that does the repeating clones... it usually happens to a bounty hunter but who ever becomes the unending cloner, have that player kill themselves quickly by jumping off the stairs near by. The cloning will stop and you can have a chance of a /win.