Citadel Skull is an achievement in Halo 3 and Halo: The Master Chief Collection. It is obtained by finding the hidden skull on the map Citadel. It is worth 25 Gamerpoints.


Find the overshield on the blue side. Then look for the wall with the blue triangular shapes on it. There should be a pillar in-between the shapes. At the top of this pillar, to the right in an alcove is the skull. Only accessible via Forge. To get the skull down use a grav lift, but make sure you see where it falls otherwise it will be lost.



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