Many years ago the city of Maretropolis was under attack by the powerful villainesses Daybreaker and Nightmare Moon, the Pillars of justice were powerless to stop them and even the great wizard Starswirl The Bearded is powerless against them. But a deal was forged with the vigilante Captain Chaos and he teleported the two villainesses and himself, never to be seen again. Now the successors of the Pillars of justice, the power ponies protect the city, but are they prepared to face Sunset Shimmer, the daughter of Captain Chaos and Daybreaker?

wow, Eternal Sunset this really does sound like the makings of a great fimfiction.

hey this is a pretty good idea and I hope you follow it up in the future.
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I hope so too.