Part three of a trilogy (The Coming of Stellas Spatium, Tirek's Reform and Starswirl's Return) that summaries how I would end the show were it up to me.
After discovering the Elements of Harmony are useless against Spatium, Twilight Sparkle, Starlight Glimmer, Discord, Tirek, Cadance and her daughter Flurry Heart discover the key to defeating their foe is a legendary magician thought long-dead.
Whether the group save Equestria and the entire multi-verse from being enslaved or not doesn't matter...between the deaths, injuries, unrequited affection, reformed villains, and promotions to nobility, it's clear Equestria will never again be the same after this pulse-racing finale!