Angry Skull
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Level: Gravemind
Difficulty: Legendary
Text on the Screen: " Angry "
What the Skull Does: You can use this skull as a third weapon, and it also makes grunts shoot a lot faster.
How to Find the Skull: Kill all the covenant on the level. You'll eventually reach the outside area. Turn right immediately and you'll see some crates (covenant) on the ldge...jump off of the crate and onto the ledge. Keep walking until you see a large girder and then jump onto it and go back toward the area you came from. There's an invisible grunt with a fuel rod cannon - kill him and keep walking to the end where you'll see the Angry skull above a small grav lift.