Sure You Wonder How We Can Make So Huge A Cloud

Silly Humans! You still don't understand how powerful, We, The Great Old Ones, are, ney ?

Al right, I'll explain how we covered the North Sea with ashes. Not a huge achievement for Us, anyway.

So, when Ithaqua decided to have His party, He had some conditions: must be far in the North where His powers are greater, there must be wind, big wind, and He loves clouds, too.
When You have Friends like the Cthonians attending to Your Party, and the place is a volcanic island, lost in the Northern Sea, covered with Ice, surrounded with winds, it's not complicated.

The main problem for Our Cthonians Friends is that they don't like water. They almost can't suffer to see it, I mean.
So They had to reach the place tunneling far away in the roots of the oceanic plateau, bringing rocks, lavae, gases, hydrocarbure for the fun.
When They came to the surface, by the volcano's chimney, the ice covering it melted in huge clouds.
The Wendigo dancing with strippers made the clouds whirl.

That's It. No Magick here. Just physical and natural forces.

But, hey! What if We turned this into a supervolcano ? The clouds would plunge the whole planet in a nuclear winter.

If you don't know what I'm speaking about, take a look at this: http://en.wikipedia.org/wiki/Supervolcano

Latest small one, in 1815, was named The Year Without A summer
Small, but caused much havoc and death among Humans...

I'll feed this idea to the brides. Stay tuned for the marriage. All the Human Race (and their pets) will be invited, this time!