Invincibility

In the second set of Arbiter levels, between Regret and Quarantine Zone, there is a specific point where you can not die, even if a rocket hits you. The level should start with Tartarus dropping you off on a ledge. The Enforcer gets behind you and he drives it off. Continue playing until you get to the point where you drop down a tube and see nothing. If you walk to the ledge facing out of the stage and look down, you should see a Phantom just floating there. Go down the piston in the center of the room. As you fall, stay in the center if the tube. When you get to the end of the fall, there will be a bar going across the exit. Land on that bar and nothing can kill you, not even the three waves of the Flood infection form that come out of the tube after you.