Skull/Halo: Combat Evolved Anniversary

The  are game-modifiers that will be featured in Halo: Combat Evolved Anniversary with the appearance of a human skull. Like in Halo 3, they must be hunted down within the campaign levels to gain access to them. Unlike in past Halo titles, skulls in Halo: Combat Evolved Anniversary cannot be picked up and used as melee weapons. The skulls will not be visible in Classic Mode.

Iron skull
This skull is exactly the same as its Halo 3 counterpart: Dying in co-op forces all players to restart at the last saved checkpoint, while dying in solo play forces the player to restart the entire level.

This skull can be located in the very beginning of the level Pillar of Autumn. As soon as you are able to move freely in the Cryo room, walk to the back of the room towards the two large barrels to your left. The skull will be behind these barrels.

Mythic skull
Mythic gives all Covenant AI twice the health, while also giving all Sentinels energy shields.

This skull can be found in the level Halo near the very beginning. Once you have crash landed and are informed to take cover before the Covenant dropship arrives, walk towards the small lake in the area that the waterfall deposits into. Within this lake, the skull can be found behind one of the many rocks (specifically, a rock positioned along the shoreline near the cliff face).

Boom skull
Once the skull is activated, explosion radius will increase two-fold.

This skull is located on the mission "Halo," right after you first get the warthog. Instead of entering the forerunner cave, go right until you are above the cave. Skull will be on one of the cliff ledges.

Foreign Skull
Makes it so players will be unable to pick up or use Covenant weapons.

Located in The Truth and Reconciliation map, in the room with the 2nd set of hunters. Go through the doors the hunters normally come through, and the skull will be on your left.

Famine Skull
Acts like the other Famine Skulls. Weapon drops have less ammo (specifically they drop half the ammunition they otherwise would have given).

The skull is located on the Silent Cartographer. Once you land on the beach, head left instead of right. There will be a mesa with a winding path up to the top. It is where the crashed Pelican appears later. The skull is at the very top and farthest edge of the mesa. It is surrounded by three bushes.

Bandanna Skull
Supplies infinite ammo for weapons in the campaign.

This skull is located on the Silent Cartographer. Once you get to the security control room, go out to the right ledge and grenade jump up to the platform. Skull is on the end.

Fog Skull
Fog is like its predecessors in previous installments - it disables the motion tracker.

This skull is found on Assault on the Control Room. The room is right after your first elevator ride, and the room itself has a column in the center with steam rising within it. You must grenade jump to a large platform that will allow you to jump directly into the little room up above the steam vent.

Malfunction skull
Once the skull is activated, one random part of the HUD will disappear at every respawn.

On Assault on the Control Room. Once you get the tank, you will head down to an underground room with two bridges, one of which is out. Next to the bridge that's out, there's a pipe, and the skull is there.

Recession Skull
Every shot is worth twice the ammo, thereby taking only half as long to empty out a weapon.

This skull can be found on 343 Guilty Spark. As soon as the Pelican drops you off at the beginning of the level, do a 180 and run until you reach the wall at the edge of the level. Once there, turn right and follow the wall around the edge of the level. Eventually you will reach a small grove with two trees and some shrubs. Nestled between the two trees is the Recession Skull.

Black Eye Skull
Like previous installments, using this skull causes your shields to only recharge by performing melee attacks on enemies.

Located in The Library. Once you clear out the enemies in the first room (before you enter the room with the index hovering above you) grenade jump onto the block closest to the flood spawning tubes. The black eye skull will be in the right spawning tube.

Eye Patch
Auto Aim Features are disabled for all weapons.

This skull is found on The Library. Once you get to the index, instead of going towards it, walk around it. The skull will be next to one of the blocks that stick out of the floor, and it's in plain sight.

Piñata Skull
Punching Enemies will make grenades drop.

This skull can be found on the level Two Betrayals. Just before you disrupt the third relay, fly onto the plateau above where you exited the underground tunnel. You will find the skull behind one of the walls there.

Grunt Birthday party skull
Once the skull is activated, the Unggoy's heads will explode in a shower of confetti with a headshot.

It is found on the Level The Maw, in the part of the Warthog ride where Echo 419 crashes. The skull can be obtained by placing the Warthog next to the beam-like structure on the right, jumping on the vehicle and then on the platform where the skull is located.

Grunt Funeral skull
Once the skull has been activated, every Grunt's methane tank will explode similar to a plasma grenade when killed. This skull will only be available to those who pre-order the game.

Trivia
It's possible the Bandanna Skull is a reference to the videogame series Metal Gear Solid. In those games, a potentially unlockable item is a bandanna which supplies infinite ammo; similar to the skull's effect. Another possible reference is to the Rambo series, starring Sylvester Stallone, who frequently donned a bandana while gunning down enemies, seemingly with unlimited ammunition.

The Famine Skull is the only Skull in the selectionlist that has no teeth.