After the changeling invasion, Princess Celestia realizes that far worse threats to Equestria may be out there, waiting to attack. Twilight Sparkle needs to learn a way to combat these threats without giving up who she is in the process. Enter Eclipse, a long-forgotten ally to Celestia and Luna both, whose magic may be just the thing Twilight Sparkle and Equestria needs.

AN: Okay, the OC... I won't tell you to give him a chance, because that's presumptuous. I just ask you to trust me.