Equestria is dying.

There is nothing anyone can do about this.

The sun has shined too long. The Age of Sunlight must come to an end. But Celestia refuses to let it extinguish, and the land is shrouded in everlasting dusk. And now, among the living, are seen bearers of the accursed Darksign. Those doomed to die, again and again, until their minds fade away and they turn hollow, forever seeking the souls of others for nourishment, in a futile attempt to regain their lost memories and lives. But there is now only one way for their suffering to end. Celestia must be slain, so that the Age of Dark may take its natural turn.

Co-created by Akumokagetsu

Cover art from PonyChaos13 on DeviantArt

'Dark Souls' crossover.