The Hailskies

The Hailskies is a name for the sky above the Mountain's End Range, a great empty expanse with the occasional deadly cloud-glacier.

Description
The skies over the interior of Polaris are bitterly, unbelievably cold. No evaporation effect takes water from The Starlit Sea, so only clouds and atmospheric debris from without enter the sky. Over a period of hours, these freeze solid and, supported by radient power from the Aurora Animus, slip slowly into the mountains, crashing into the peaks there in great collisions which can take days to finally finish.

History
There's not much history about this effect, save the fact that anyone wishing to take to the skies over Polaris must have a source of heat to counteract the unnatural chill.