I've been thinking that a raid on a hyperborean sky ship would make a pretty cool higher level adventure. I'm writing this thread as a clearing house of ideas and to collect any feedback others want to share.

the basic idea is that an antagonist has found and recovered a hyperborean sky ship. This would be an immense vessel of great power that flies through the sky. Conceptually thinking like a giant galley, but the oars move as if by unseen hands.

Now the ship would be fought over by a few factions:

1)the PCs. 

2)a contingent of actual Hyperboreans, trying to re-capture or destroy her. Maybe instead of Hyperboreans, as this would be harder to justify, what about a squad of particularly commando-like Amazonians or an equivalent number of Ixians.

3)the antagonists who have repaired the ship. Thinking good old ubiquitous snakemen might be a good enemy here, but of course the Mi Go would be great too, with different Oon for the crew of the ship.

what will most likely happen is that the ship will crash into the ocean or the Spiral Mountain Array in a great orgy of destruction.