When you are the Master Chief trying to recover the index from the Prophet of Truth on the Covenant Holy City, go until you reach the first outdoor area with dirt and vegetation. Take a right as you enter this room and run up to the wall past the gravity lift that leads up to the sniper point. Get on top of the wall by going up the dirt mound on your left. Follow the wall until you reach the floating skull called Angry. This skull makes enemies fire at a faster rate.
A skull similar to the one that activates Blind mode can be found if you start on "Regret." After the first lift ride (before the first underwater elevator), grenade jump from the front awning of the lift to the ledge in front of you (the one with two turrets). Grenade jump again onto the next ledge. Go to the back of the building. On Easy, you'll only find the skull. On Legendary, however, 2 invisible elites carrying swords just shake their heads wildly, ignoring you completely.
At the beginning of Outskirts, crouch jump on top of the light over the door, then jump to the left platform. Turn to your left and go down the long dark corridor and pick up the skull; it says blind and your screen flashes black for a while. In this mode you can not see your weapon, body, shields, ammo, or radar. To get rid of this feature: 1. Turn off your Xbox or Save and Quit. 2. Go to Campaign and select level and choose Cairo Station. 3. Skip the cinematics and then Save and Quit. 4. Go Outskirt and your HUD is back.
On the level Delta Halo on Legendary difficulty, progress until you reach the area during the "Push through the covenant held ruins" where you have to clear a Landing Zone for the Pelican to drop weapons. You will know you are in the right area when Cortana says, "They're pouring out of the center building." That area has plasma turrets along its borders. A little bit after the left side turret you see the outline of a door in a wall, but the door has a solid rock slab in it and a rock in front of it. Jump on the rock then jump to the ledge above the door then jump on the ledge to the left. Now jump onto the building with the sealed door using grenades. Atop the building you will find two dancing elites and the "Envy Skull." Pick up the Envy Skull and you can use Active Camouflage like the Arbiter.
After you get off of the slowly descending elevator in The Oracle, you come to a hallway where you see a handful of dead bodies. Continue into the next room, and you will be on the second floor of a room with windows. When you enter this room, look to the right, and find the third pane of glass. It should be to the right of a wall that has some flood guts splattered on it. Shoot out this window, and either window directly across the room. If you look below you will see a platform that has four tall posts. On the room's far side is a column between the two windows. Turn on your active camo, and jump to the center platform. Jump on either of the posts on the far side of the platform and jump to the column between the windows. Jump through the window you shot out and make a left. Walk all the way to the end and you'll find four flood elites convulsing on the floor, with the Famine Skull in the middle of them. When you have this skull, all weapons will have less ammo.
In the level Arbiter on Legendary, once you get to the first banshee section, immediately fly straight to the bottom of the map. In one of the cracks where the large cylinders connect to the station are a circle of grunts dancing around a skull. When you pick up the skull, it says Grunt Birthday Party on the screen. Now when you kill a enemy with a head shot, they blow up like a plasma grenade was stuck to them. To get rid of this feature use the same method as the Blind mode.
On the last Master Chief level, on Legendary difficulty, when you enter the final Gravity Lift, look up. A skull passes through you extremely quickly, so start holding X a bit before you actually pass it to grab hold of it. Once you grab the Iron Skull, Iron mode will be activated. This skull causes you to go back to the last checkpoint when you die in co-op mode.
In Sacred Icon, there's a pair of semi outdoor areas, each with a large sentinel in front. Go past this area and down the piston and you'll be in a vary dark and dank flood infested area. Use the boxes to jump up to the landing above. A handful of alcoves are on your right. The skull is in the third alcove, floating above a dead human flood.
At the start of Quarantine Zone on Legendary difficulty, turn directly around, and see a tunnel. Head through the tunnel. Go straight across the open area, and you'll come across a broken pipe tunnel on your right. Straight in front of you is a small ledge running across the wall, above the green pit. Carefully get onto that small ledge and walk to the end to find the Sputnik Skull. In this mode explosion force and melee force is greater.
On the level Cario Station on Legendary, get to the "Priority Shift" checkpoint. Progress until the room with mounted plasma turrets, right after the armory with the elites. Clear out this room, and get on the raised area with the plasma turret on the side of the wall where the window curves. Look for two parallel beams on the ledge above. Climb up the supports for these beams and crouch jump up onto the upper ledge, then onto the beams themselves. Walk in the direction you came from, jump on a small ledge sticking out to the left, and pick up the Thunderstorm Skull from inside the trash container. This turns all Covenants into their spec ops rank.
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