Far off to the west of Equestria lay The Eternal Lands, an immense expanse of desert that holds at its heart a precious jewel: the city of Gallopfree, sprung up around a peculiar bit of water known as the Well of Eternity.

Prodded by a little whimsical intuition, Princess Luna finds herself walking those winding streets of her ancient past, and holding conference with the enigmatic Steward of the Well...