This story is a sequel to Pegasus Device

After The Rainbow Factory's secrets being revealed and it being closed, a group of six powerful ponies named "Elements of Chaos" conspire to transform Equestria into a perfect utopia... at least for one of the pony races.
Their leader discovered an ancient, powerful and feared pegasi empire: Kaskea. Kaskea once disappeared in history, now this determined pegasus want to bring this empire back to life whatever it costs... even the lifes of innocent "non-pegasi".

This story is based on "Pegasus Device" by AuroraDawn and a fan sequel of it.