Halo: Campaign Evolved

Halo: Campaign Evolved definitely features some major differences from the original game, but if there’s one thing that’s the same, it’s that the Library mission will get players up close and personal with an onslaught of Flood enemies. If you’re trying to track down the various Skulls in The Library, it can be a little distracting with the waves of enemies, so be sure to take out as many as possible before you start trying to collect this set.

As with all missions in Halo: Campaign Evolved, there are three somewhat hidden Skulls scattered across The Library. These are the Tilt, Pop, and Famine Skulls, two of which are required to unlock the LASO Difficulty setting and all of which are obviously required if you want to collect all Skulls in the game. Fortunately, these aren’t too hard to reach as long as you take out the Flood enemies first.

All Library Skull Locations

First off for Skulls in The Library is Tilt, which is located immediately after you exit the service tunnels and enter a long corridor with several Flood enemies and Sentinels flying around killing them. Just as you exit the small tunnel, there’s a ramp to your right you can ascend and the Skull is placed there at the top.

When you reach Rally Point Bravo, you’ll eventually get to a closed red door that 343 (aka The Monitor) will need to unlock while you fend off a wave of Flood. If you’re looking at the door, do a 180 turn and on the opposite wall there will be a small ledge protruding out that you can either fly up to with Acrophobia on, or you can crouch jump up to from the nearby platforms.

Skull	Rally Point	Difficulty	Location	Effect
Tilt	Alpha	Any	After exiting the service tunnels, immediately turn right—the skull is on the pillar.	Increases both weapon strengths and weaknesses (plasma is more effective against shields but less effective against health)
Pop	Bravo	Any	While 343 is unlocking a large red door, turn around 180 degrees and look up. The Skull is on a ledge on the opposite wall. You can either fly or crouch jump up to get it.	Shooting Flood weak points causes explosions.
Famine	Charlie	Any	Once you reach the bottom of the level on the elevator, exit the area and go straight, then follow the ramp forward and down to the left. The Skull is in the corner beneath a bunch of Flood goo.	Enemy-dropped weapons contain half ammo.

Finally, the Famine Skull is found once you reach the very bottom of the elevator after Rally Point Charlie. Head out into the main area, but continue straight toward the Flood tunnel ahead. Go down the ramp and hang a left, and you’ll see the Skull there sitting on the ground next to the wall of Flood goo.

All Library Skull Effects

Two of the Skulls on The Library are required to unlock the LASO Difficulty setting (Legendary All Skulls On): Pop and Famine. Pop causes Flood enemies to explode when you kill them on a weakpoint, while Famine causes weapons dropped by enemies to only have half as much ammo as they would normally.

Tilt is an interesting Skull that increases both weapon strengths and weaknesses, and causes plasma to be more effective at draining shields while being less harmful to enemy health. All three are required for the Headhunter trophy, obviously, but if you tracked down the Tangent III Terminal near Rally Point Bravo in The Library as well, you’ll unlock the Timeless Tomes trophy in Halo: Campaign Evolved as well.