Halo 3 invincibility glitch
From Halopedia, the Halo wiki
The eXo invincibility glitch is another eXo founded glitch that can cause the user to be invincible, hence the name. Here is a video link, [1]. As shown in the video, you can become invincible. Though, when they die from being meleed by a gravity hammer, the game will lag for the rest of the game. Once you leave Forge, everything will be normal again. You can still die from explosions and getting rammed by a vehicle.
Tactics
A good tactic is to get a team who has had experience with the eXo glitches, and use it against the enemy team. Though, take heed, you can also get killed by vehicles ramming you and large explosion can kill you. You are invincible other than that. The only melee that can kill you is a Gravity Hammer blast, which can take up to two blasts to kill.
