you need two people and to be in forge mode now now don't get upset but it is mega hard i know how to get it just mega hard and i can't get it fisrt you spawn a warthog and make it not have a turret...
you go to the second level, shoot the 2nd building on your right with the crystal gun, walk forward 10 steps, shoot for 3 seconds, blow youself up with a plasma grenade. When you respawn walk to the...