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Skulls are used for basically modding or changing gameplay throughout the campaign, for example: The "Tilt" skull changes around damage and armor effectiveness for the enemy, or the "IWHBYD" skull, standing for "I Would Have Been Your Daddy", this skull changes around the covenant's speech to more rare, and usually funny dialouge. Also, collecting certain numbers of skulls will unlock unique achievments and armor pieces. You can check out more here:

http://halo.wikia.com/wiki/Halo_3_Skulls

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13y ago

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