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The Thunderstorm skull upgrades your enemies, so like they go up in rank, it makes it 1.5 times harder, and they are worth more points when playing the metacampaign, which is basically playing for points. and are often used to get the metacampaign achievements.
Source: 4 Years of playing Halo 3
Hope i helped
What else can I help you with?
Is ther a skull on the map halo on Halo 3?
No
In Halo 3 why does the first skull not count as an achievement?
The first skull on halo 3 is a silver skull. Silver skulls do not award any achievements.
How do you claim a Halo 3 skull?
After finding a halo 3 skull, simply pick it up as you would any other weapon.
What do you do once you get a skull on Halo 3?
once you get a skull in halo 3 you can co to the campain options and turn it on different skulls do different things
How many skull are there on Halo 3?
13
Where do you fing the skulls on Halo 3?
http://www.halo3planet.com/halo-3-skull-locations/ is were I found them
What should you do if you messed up the seqeunce of jumping through the rings to get the tilt skull in halo 3?
You do not jump through rings to get the tilt skull in halo 3.
What does the fog skull do on Halo 3?
the fog skull takes away your radar. you find the skull on floodgate
What skull in Halo 2 gives you overshields?
There are not skulls in Halo 2! It's just Halo 3!
How do you pickup the skull in Halo 3?
you walk on top of it
Where is the skull on Cidel on Halo 3?
halo on your faceinit blad diary of a badman rules
Do you need to be playing on a certain difficulty setting to get a gold skull in halo 3?
you need to be playing on normal,heroic,legendary to find any skull on halo 3
