Ghost Skull
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Level: Uprising
Difficulty: Legendary
Text on the Screen: " Ghost "
What the Skull Does: Not sure.
How to Find the Skull: There's an L shaped room after you pass the outside area that has ghosts and grunts. This is after the room that has covie and marine weapons. Now you need to grenade jump using a ghost (that you jack) up to the rafters. You'll see the skull above the door and if you hold X while jumping, you'll pick it up.