This page contains Halo 3: ODST Unlockables for Xbox 360 called "The skull on Citadel" and has been posted or updated on Sep 27, 2009 by game chicken. Let us know what you think of this Unlockable by thumbs voting.
The skull on Citadel
Go to the over shield in forge mode look for the triangles on the walls fly up to them and you will see the skull.
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