Halo

The Halo universe is the sprawling fictional universe in which all mainline Halo media takes place. In the 26th century, humankind has colonized hundreds of worlds in Earth's interstellar neighborhood, only to stumble upon a hostile alliance of aliens known as the Covenant. Motivated by the Prophets' promises of ascension to godhood in the form of the eponymous Halos, a series of ring-shaped superweapons built by the ancient race of the Forerunners, the Covenant are bent on humanity's destruction. With the apocalyptic Human-Covenant War concluded, members of both sides are faced with an uncertain future in a politically complex environment of numerous different factions and affiliations, while ancient Forerunner entities and technologies continue to involve themselves with the galaxy's affairs.