Based on the Firehooves Cycle. Twenty five years after Twilight Sparkle passed away a disguised and amnesic Celestia meets Dream Catcher a Pegasus Stallion who recives visions through his dreams. They will face a number of obstacles both when her memory resurfaces and when he sees visions of her death.
Into The Lair Of The Sun God, Part I - Dawnbringer
Is this set in firehooves' universe? I think that's the guy who was writing all the stuff about Ponyville being a theme park, etc.
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Yes I looked over all the works he did in order to try to make it work within his universe.
*Sight, I really wish more people would read this, it's a really good story, and it really does fit with my universe!