As the Pre-Equestrian Era approaches its end, a new society surfaces. Corruption prowls the land and the encroaching Gryphon army seeks to lay waste to the three pony tribes. However, a much more dangerous threat is dwelling within, a threat that could destroy everything that ever existed and will exist.

Two millennia into the future, Equestria is entering a new, prosperous age. When the researchers of the Canterlot research branch initiates a project that will allow ponies to peer into history, a secret sealed since before the Hearth Warming is unveiled. An experiment with recreating tangible virtue history goes wrong, possibly changing the very history of Equestria... for better or worse.

ON HIATUS INDEFINITELY
Beware of spoilers in the comments section. Artist is here though the image source can no longer be found (removed from deviantart).