Fog (achievement)
From Halopedia, the Halo wiki
Fog is a Halo 3 Campaign Achievement. It is earned when the player finds the Fog Skull. This Achievement gives 10 Gamerpoints to the player.
It is represented by a blue circle with a skull in the middle. The skull has a swirl of fog on its forehead.
Effect: "You’ll miss those eyes in the back of your head." -- Your motion sensor disappears.
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The Fog skull can be found on "Floodgate" on normal or higher difficulty. To get it, you walk toward the city, look up, a flood form jumps from one building to another overtop you, shoot it and it drops the skull.
