
125,000 BCE Ancient spacefaring races called the thoi'han and inusannon fight over the planet Eingana, littering the planet with the debris of hundreds of starships. They also maintained a presence on other planets in the system including Epho, which bears the scars of an ancient orbital bombardment, and Gaelon, which may have been mined for helium-3.Ĭ. 298,000 BCE The ancient arthenn race flourish in the Zelene system, living on the planet Helyme until being destroyed in an unknown event that wiped out all complex life on the planet. The round penetrates the Reaper, disabling it, and continues moving through space, eventually striking the planet Klendagon and creating the geological feature there known as the Great Rift Valley.Ĭ. 37,000,000 BCE An unknown spacefaring race fires a mass accelerator round at a Reaper near the planet Mnemosyne. Its corpse comes to rest on the planet Jartar and remains undisturbed for nearly one billion years.Ĭ. 1,000,000,000 BCE The Leviathan of Dis, a Reaper, is killed by the Leviathans.


The Intelligence builds the mass relay network to increase the efficiency of the cycles, allowing galactic civilizations to develop faster and more consistently between harvests. Thus begins the cyclical harvest of the galaxy's intelligent organic life by the Reapers, part of a vast experiment conducted by the Intelligence to fulfill its mandate. The Intelligence betrays the Leviathans, using its pawns to slaughter them for their genetic material to create Harbinger, the first Reaper. The Intelligence constructs an army of "pawns" to gather genetic information throughout the galaxy. After observing that their subservient races create synthetic races who consistently and violently rebel, the Leviathans create an Intelligence to seek a way to permanently preserve organic life.

The Leviathans consider themselves the galaxy's first and only apex race. The Leviathans dominate the Milky Way, enthralling every new sapient race they encounter and protecting them in return for tribute.
