In the level Covenant when you get the tank, warthog and mongoose, take the tank and kill all of your enemies.

If you don't they will destroy the ghosts which you need to perform the glitch.

Drive the ghosts past all the enemies 'til you get to a part where the wall gets the least steep and boost straight up and over that wall.

When the floor disappears don't stop, you won't die, keep goin' 'til you teleport then most likely you'll die so play co-op.

When you tele' go right and you'll see an odd cliff, ride the cliff and don't worry it's an invisible wall.

After walking a while you should tele' again but back to where you went up the cliff.

Then go like you would with out the glitch but all enemies should be gone when you hear "2 scarabs inbound, I repeat 2 scarabs" you automatically hear "Both scarabs down good job".

Go down a hill and you'll see a pile of enemies dead with weps galore and also an invisible elite will be under where the grav bridge should be and 2 elites on top of a ledge next to the big tower.