Well the Fog skull is on the level Floodgate. When you are walking towards the first battle you'll hear Flood roaring. Take note of the Flood jumping across the roofs. Use a Battle Rifle to kill the Human form when its in the air. The guy will drop the skull.
Sorry there arn't any, The only skulls are in "Halo 3" Which are used in "Halo 3 O.D.S.T."
Get some skulls dummy
They are skulls. idiot.
you can get all of the skulls on multiplayer. =)
ok, go to youtube and type in "how to find all halo 3 skulls" then watch the video and get the skulls. yes, its that simple.
if you want to know where the skulls are all you have to do is go to youtube and put in "halo 3 odst mythic skulls" and it will show you how to get to them
find the skulls
There is many silver skulls, look up a tutorial.
Find them your self
There are many Gold Skulls. Look up a tutorial.
http://www.halo3planet.com/halo-3-skull-locations/ is were I found them
By getting skulls.