Unknown to the galaxy at large, a massive, deadly fleet from an alternate universe had managed to cross the threshold between dimensions. The Chrell, an alien race of blue skinned, cybernetic humanoids, had discovered a vast new dimension of unconquered territory. They set to work to add this universe to their empire. They engaged the Green Lantern Corps first. The Lanterns were taken by surprise. Both the Guardians as well as the planet OA were completely destroyed. All Green Lanterns in the vicinity, including all known lanterns from Earth, were killed. The Guardians' greatest weapon, Ion, aka Kyle Rayner, managed to escape in order to warn others of the coming darkness.