Princess Celestia and Princess Luna. Immortal rulers of Equestria, shepherds of the Sun and Moon, and arguably the most powerful beings in existence.
Even they are not immune to the dreaded rivalry that comes between sisters. Feeling her sister has gone soft over the millenia spent alone, Princess Luna challenges Princess Celestia to the one and only Iron Pony Competition.
Which sister will come out on top?
Now with fanart! By Soulite1110