Urelon entered the shadow of Krimanax, and everything inside of the cities slowed down. Only the most essential things were kept running, while everything else came second in priority.
The many expeditions to the outside had been slowed down as well, with nothing much needing to be done anymore now that the outside world was fully freezing.
The Spark would be difficult to handle in the cold after all. It would've been a different matter if it was cold alone with no atmosphere, but the people living inside of the cities had created enough air and water that there was a thin atmosphere outside, and when it became cold, everything was frozen in clumps of dirty, which was very annoying to go through.
They also had dug away all of the Spark they could in the past few months and needed to let the moon gather more Spark before they took away anymore.
The next 7 months where when the moon would remain on the dark side of Krimanax would be that time.