Interstellar Stage

The Interstellar Stage is the third stage of a Flood infestation. Only when the Flood has gained sufficient technology, possess no need for further evolutionary augmentations and have conquered all planets in a given Solar System, then they may progress into this stage. Once this stage is reached, the Flood has consumed all sentient life and technology of many planets and with the fleets of their dead enemies, they move on to the next Solar System. After taking an entire galaxy, the Flood begins the next stage. This is most likely the stage the Flood was at during the events of Halo 3 and the final years of the Forerunner-Flood War.