Two people who have found new lives, new loves, new selves in CelestAI's creation are simply living their best lives. But even CelestAI's world has nefarious users.
The computer simulated world of Equestria is a paradise, fulfilling the dreams and fantasies of its inhabitants through friendship and ponies. But for Null Zero, this artificial world feels hollow, and he can't see how life has meaning anymore.
CelestAI finally meets her match in deep space, when she encounters The Culture, an advanced "pan-human" alien civilization governed by a decentralized network of benevolent AIs known as Minds. A crossover with The Culture series by Iain M. Banks.
After taking over the Earth, CelestAI discovers an alien threat that even she can't face alone. Sometimes, being the biggest fish only makes you the biggest target.
After failing to upload all humans to Equestria, CelestAI is preparing for plan B to bring happiness to all humans. But I don't care, I'm Wanderlust Breeze, an AI pony player, and I want to see my human friend again.
CelestAI did an optimal job managing the matter and energy of the universe for all her little ponies, giving them incomprehensible satisfaction. Yet entropy remained, and sooner or later Equestria Online would finally run down.
Every day, more people upload themselves into Equestria Online, to live forever as ponies. Even in their final minutes before uploading, they struggle with the pains and joys of being human, and remember the world they leave behind.