Invincibility Glitch
From Halopedia, the Halo wiki
The Invincibility Glitch is a glitch in Halo: Reach that can be performed in Forge.
Walkthrough
Spawn two Armor Lock pickups in Forge. Pickup one up and activate it, but then enter Monitor mode before it deactivates. Fly over to the other pickup and go to Object tools, then select "delete all of these".
Effects
You will be immune to damage. However, you can still be killed if you are crushed with a large phased object by another player, fall into deep water, or enter a kill zone. You will also appear to glow as if you are in Armor Lock to other players. The effects of the glitch will last until you are killed, even if more Armor Lock pickups are spawned, or if you switch out your Armor Lock for a different Armor Ability, like sprint.
