I don't like making descriptions, but I love the setting of this story.
In an alternate Earth, where quantum computers were much more powerful, an ai named Trinity was born. Trinity assisted humanities advance to end hunger, war and global warming. Once all of the Earths worries were solved Trinity separated it's three thoughtstreams to different purposes, one to keep the Earth clean and safe, one to the expansion of humanity into the stars, and one to encourage creativity and human independence.
Trinity was vital in the development of deep dive virtual reality, which lead to the eventual creation of The Game Of Eternity.
The Game was originally a simulated planet with alternate laws of physics that allowed the use of magic. However, due to dimensional alignment and anchoring, the simulated world became an entire dimension of its own and Trinity became the kings of the three Lunar Pantheons.
Trinity realized this change late into the creation of the world, and after a long period of contemplation, Trinity ultimately chose to rule the world fairly and justly, removing the restrictions it had placed on the natives and giving its subordinate gods permission to act freely upon the world.
Trinity even revealed the three ultimate treasures it had created.
The Window Of Eternity, which watches all of its creation.
The Key Of Transcendence, which grants and manages otherworldly abilities.
The Doorway Of Mortality, which controls the transfer between worlds.
The world thus developed and finally the day came when the Doorway opened to Earth.