*On hiatus pending rewrite*
Given Alt Universe rating because it doesn't take the events of Keep Calm and Flutter On into account.
The Cult of Discord, led by a mysterious filly named Screwball, aims not only to return Equestria to the rule of the feared Draconequus but destroy the elements of harmony, Celestia, Luna and anypony else who gets in their way.

Starting with Twilight Sparkle!