In the distant future of Equestria, Luna is recalled to Canterlot against her will to participate in a court case that will decide the future for sentient machines in Equestria.
Princess Luna assembles a team of Equestria's most undesirable inhabitants in order to deal with the problems too dangerous to risk the lives of the Elements of Harmony.
Luna is a strange mare. Cadance is only now just starting to see how strange she is when Luna mentions the unthinkable. Maybe she'll learn something new in the process.
Princess Luna disappears from Equestria with hopes of saving the world and is accompanied by the enigmatic Sombra. Meanwhile, Celestia tries to bury secrets as immortal as she is and Cadance must choose her loyalties carefully...
Luna is a mischievous filly loosely raised by her sister in a vast world that doubles as the home she barely remembers. Neptune is a humorless king who refuses to leave his home, both of them share a distant past although their paths have split.
After years among the three pony tribes the Two Sisters fight their first great foe by themselves: King Sombra, the tyrant King of the Crystal Empire. Nothing goes as planned, everything, and everypony are not as they seem.
Luna is prepared to what no pony has ever done before and weave magic raw with all that burns within her to forge a way to escape the ostracism she has endured. She cares not what she does to remove her shackles in order to save all.