Celestia and Luna are growing up in a dark world, unlike anything the ponies of modern-day Equestria have ever seen. One day, they discover one of the mythical Eternal Stones, which are said to hold unimaginable power. With evil forces threatening the ponies of Equestria, Celestia and Luna take it upon themselves to find the other stones and bring peace and harmony to their world. But there are others who wish to have the power for themselves and the two sisters must trek through a world of uncertainty and danger in their epic quest of discovery and revelations regarding the nature and history of Equestria.