During a dark night, the night before the Summer Sun Celebration, a mysterious clan of magical earth ponies bring out a relic containing the spirit of their former leader, Nightmare Moon. They attempt to lift her spirit into the sky in efforts to conquer Celestia's Sun so night shall last forever, as they have tried years before - when the mistress of the night was finally defeated by six particular ponies whom bear the Elements of Harmony - and fail again.

When Rainbow Dash's nonchalant venture into the Everfree turns deadly a few days later, she becomes infected with a mysterious illness - only to later find out it's more than just mysterious. Could it be somehow connected to the invisible lives of the weird clan, and Nightmare Moon's deadly spirit? Has it overtaken her in a need of a new home, or is it ripping her soul to pieces in attempt to get out? Or is it really just an ordinary disease that threatens to end her life in one way or another?

Cover art by me.