Alright, I'll give you some advice. First room sit in that hole that you would get to if you ran across the whole room. Sit there and pick them of until the waves almost done, play it smart kill them. Go back for wave 2, repeat. Go back for wave 3, let them fight each other until it's a small amount of enemies left, go there pick them off and wait for the baron, sit back kill him. If you're wondering "Where the fuq do you get all the sniper ammo?" You switch to icebreaker regen it to 6 then switch to your arc sniper and it'll have 2 full clips. Second part the tank, right when you go in the open, turn to the left and go back, you can hop on this little ledge and pick everything off [b]no[/b] problem, just switch the snipers like I said in the first part. Last part with sepkim just sit in the building with the window an and pick off the adds and play it smart. Tbh it's not hard if you have a strategy.