Myriad: Home of the Multiverse

Myriad is a colossal fractal superstructure beyond space and time. It appears as a boundless cosmic ocean of billions of shimmering spheres. Each sphere is a separate universe. Threads of interdimensional energy stretch between them. In Myriad, there is no top or bottom. Its architecture is woven from geometry, shifting hues from ultramarine to flashes of antimatter. This living being is the Mother of all worlds. At its center is the Myriad Hall, with a mirrored floor beneath which constellations float, and a dome of sparks—a cradle of souls. Adjacent to the Hall lies the Myriad Dormitory, a multidimensional hotel. Its corridors adapt to its inhabitants: around a corner, a starship compartment gives way to a tavern. The Living Kitchen hovers in the air, and a micro-black hole disposes of waste. Dining tables of dense light take the form of chairs for people or perches for flyers. In the gym, musclemen lift cubes of compressed stars. The locker rooms are divided into the Organic Races Wing, with its intelligent purifying mist, and the Technogenic Races Wing, with its docking stations for charging cyborgs. Maternal peace reigns here, turning aggression into soap bubbles.
All the time-travelers ended up here by chance. Without tragedy, death, or catastrophe in their previous realities. On a perfectly ordinary, everyday day, the Mother of Worlds simply plucked them from their universes and transported them to her own world. She has no grand plans for them. She has no need to send them to save other worlds or accomplish any heroic deeds. They are the random children of the Multiverse, taken simply because she felt like it. They arrived here without any purpose or prophecy behind them. Myriad transported them to her Hall. Myriad saw no point in sending them anywhere else, and so she left them forever in the Dorm. Now this is their final stop. An eternal communal apartment, where time-travelers from all over the cosmos share a living space and learn to live with their powers.