Thunderstorm

The Thunderstorm skull is found the the level, The Covenant . It turns all grunts into spec-op grunts (I forget if it increases the rank of brutes and jackals but I doubt it does).

EDITOR'S NOTE: It gives a promotion to any unit that has ranks and can receive one, including Brutes.

You better be good at getting headshots because these grunts just won't die! I have to put a whole assault rifle clip into them if I don't aim for the head! Anyways, onto how to get it.

Step 1
After you deactivate the 1st tower, get into a hornet.

Step 2
Fly over to the 2nd tower that the Arbiter and the elites deactivated.

Step 3
Land on the 2nd tower.

Step 4
Climb up to the top of the big ramp.

Step 5
Pick up the skull.

Now you have the Thunderstorm skull. Hope you enjoy wasting your ammo on one grunt and the 10g.

P.S. Congrats on the podcast!