Princess Celestia, the governess of the sun since time immemorial, has been slain in cold blood by the darkest of magics. Binding her very life to the sun as she was assassinated not only ended her life, but caused the very sun to perish along side her. With the world now cast in eternal, freezing darkness and their very planet speeding out of it's orbit, Twilight and Rainbow Dash must reignite the fire that sustains all life, or die. As they traverse their dying world, they learn of the suns capacity to give life and of it's history with it's fallen vessel. They will learn of wondrous magic and strange technology that the remaining souls are using to sustain them through the endless winter. This is the tale of light and dark, life and death, loss and rebirth. All in a quest to leave a fire for tomorrow.