The Shift

The Shift is a cataclysmic event in which seven versions of Earth from parallel universes were merged into one. The survivors from these different Earths then form a melting pot of unhappy species. The cause of The Shift is currently not understood.

The Heralds
The Heralds are beings, one from each of the seven Earths, who have acquired a Core, which grants them special abilities and guides them toward an unknown location.