There existed the Continuum at first, a single, harmonic world in which the laws of physics were unchanging and fixed. The Continuum was in perfect equilibrium for ages, and gravity was the basic force holding all things together.
Then came the Fracturing.
Seventy years ago, a group of researchers referred to as the Quantum Architects tried to control the basic principles of existence. Designed to control gravitational fields to generate sustainable energy, their experiment took place at the Nexus Research Facility. Rather, it split the fabric of reality.
The Architects' Gravity Engine's catastrophic failure set off a chain reaction breaking the Continuum into five separate realms, each with individual qualities and physical rules. Gravity Wells, the fracture sites, started to operate as unstable gates separating these worlds.
Following this, the survivors were dispersed over these new realities and had to adjust to surroundings in which gravity itself could not be relied upon. While some dimensions had gravitational fluctuations, others evolved whole unique connections with this basic force.
These broken realities lived in solitude for decades, only the most courageous adventurers trying to negotiate the hazardous Gravity Wells. Every dimension evolved its own culture and perspective of reality as the knowledge of the united Continuum vanished into myth.
A fresh catastrophe now strikes. The margins between dimensions are getting more erratic, leading to disastrous "shifts" that might bring all reality into oblivion. Understanding the original Fracturing and knowing how to either permanently stabilize the fractured dimensions or restore the Continuum will provide only hope.
Here is where your trip starts.