The world has reached its end and mists consume everything, blankets of ice and coldness rolling over the lands. The light of the sun itself is beginning to fade and it seems that there is no hope left.

At the edge of the world, in a mysterious castle, a ritual is to be performed. It is the last chance that ponies have to survive as a race, but the consequences of its failure are great. A terrified young pegasus is forced into an impossible choice and a familiar figure helps her along the way.