Invincible Grunt

The Invincible Grunt glitch is a glitch that can only be done on the level Sacred Icon in Halo 2.

Walkthrough
To find it, play the level Sacred Icon on any difficulty. At the beginning, there is a red Grunt Major cowering next to the piston. To make the Grunt invincible, follow the steps below:


 * Arm it with a Plasma Rifle.
 * Open up the piston and push him off, down to the first level.
 * You can now melee it, and it will not flinch from attacks nor will show blood when fired at. You can throw grenades at it, but it will not die.

Trivia

 * If you kill any Constructors, the glitch will not work.
 * This glitch can also be done by letting the Grunt activate the piston and then throwing a grenade at it.