Within the shield that covered the castle were the cracks starting to emerge. Cracks that would have lead over to the shattering of it in the end. Thus letting it fall back in the natural day and night cycle that the world carried. And secondly, if she looked out of the window and towards the fog, it could already be seen dissolving. The fog that had kept the place hidden from the world, wouldn't be existing much longer. Thus revealing the castle to the poor souls who dared to come that deep into the woods. It was worry upon worry but Rarity couldn't leave the castle. It would become her home whether the forces above her liked it or not.