Collectibles

This skull makes the game much harder. Use it for challenge runs.

Requires aggressive playstyle. Good for melee-focused builds.

Makes enemies much more aggressive and unpredictable.

Watch out for increased grenade spam from enemies.

Makes stealth and situational awareness much harder.

Forces more careful ammo management.

Makes all enemies tougher and more dangerous.

Makes you deal more damage but also take more damage.

Makes all enemies much harder to kill.

Extremely challenging - no HUD information available.

Fun for physics-based chaos.

Purely fun - headshotting Grunts causes confetti explosions.

Unlocks rare and funny dialogue from characters.

Makes combat extremely intense and challenging.

Very powerful - makes you nearly unstoppable.

Makes explosives much more powerful but also more dangerous.

Makes aiming much harder, especially on controller.

Forces you to stick with UNSC weapons only.

Makes enemies much harder to stagger or interrupt.

Grunts explode when killed, causing area damage.

Randomly removes HUD elements each time you die.

Fun for melee-focused playstyles.

Makes ammo management extremely important.

Makes enemies much harder to sneak past.

Makes Flood encounters much more dangerous.

Changes movement physics in interesting ways.

Makes Flood encounters more explosive and chaotic.

Forces you to take things slow.

Creates an interesting risk/reward dynamic.

Allows you to switch weapons while reloading.

Forces you to use hip fire for all weapons.

Be careful not to hit friendly NPCs.

Forces you to stay airborne as much as possible.

Makes the Assault Rifle much more powerful.

Forces you to reload at empty magazines.

Makes headshots much less effective.

Rewards aggressive, health-managing playstyles.

Changes the entire feel of the game.