Long ago, before the founding Equestria itself was an empire beneath the very earth. It was vast and extended down several miles underground, and were kept alight by life giving crystals. After several thousand years of prosperity and growth, the empire went silent, not a signal citizen of this empire has been seen or heard from since. Now after many years of silence have past, a lone pony finds herself lost in the vast labyrinth of tunnels and ruins of the old empire. Not only must she navigate the tunnels and their secrets, but she must also figure out who she is and how she came to be lost in the very tunnels she awoke in.