Princess Celestia (Eris's dimension)

Princess Celestia was an Alicorn Princess in Princess Eris' dimension.

History
This Celestia's history was presumably identical to that of Princess Celestia of Equestria, up until the Pillars of Equestria attempted to banish the Pony of Shadows to limbo. At that point, Princess Eris interfered, and the Starswirl of that reality was killed by the Pony of Shadows. Fortunately, Celestia and her sister Luna were able to escape the tyrant with help from the remaining Pillars. After studying Star Swirls' research, the Pony of Shadows desired to corrupt Celestia and Luna into his successors. However, he was unable to find the pair, and thus resorted to seeking out alternate versions of the princesses to infuse with his power.