Halo/mass effect/aliens time line

3 billion BC=Start of the Precursor recorded history.

2.4 billion BC=start of the Precursor/Ravager War.

2.1 billion BC=the Ravagers capture Precursor technology, and turn themselves into Reapers.

Catalyst, (a rampagant Precursor AI that was made to find a solution to the organic/synthetic struggle) contacts the Ravagers, and convinces the Ravagers to let Catalyst use old Precursor technology to turn them into Reapers.

1.85 billion BC=the Precursors create the sentient parasitic disease called the Flood to infect the Reapers. The plan fails.

1.8 billion BC=the Precursors mutate the Xenomorph species, changing them from a species on the verge of becoming a civilized race, to a species of biomechanical killing nightmares.

1.799999 billion BC=the Xenomorph 'Tread Lightly', is born.

1.5 billion BC=the Xenomorphs are the Precursors primary soldier for fighting the Flood; their acid blood preventing them from being Flood-infected.

0.85 Billion [850,000] BC=end of the Precursor, Xenomorph/Reaper, Flood War.

The Precursors seal Catalyst into a containment vessel and launches it into dark space. The Precursors rewrite the Reapers commands, and shut them down. The Flood is de-organicfied, and the remains put into dark space.

849, 999 BC=Xenomorph Tread Lightly, is transformed into a Xenomorph/Precursor hybrid. An unexpected side effect is that he can change his form, his species, at will. His new name is: Eliii Yiiiti.

849,984 BC=Xeno/Precursor Eliii protests over mistreatment of Xenomorphs, and other sentients. He is exiled.

350,000 BC=the Precursors build their successors, the Forerunner, and their successors'' successor, the Human. The Precursors set themselves up to be defeated by the Forerunner. The Precursors depart to the Andromeda Galaxy.

112,500 BC=start Human/Flood War.

112,200 BC=start Forerunner/Human War.

112,150 BC=end Human/Flood War, Humans win. End Forerunner/Human War, Forerunners win, Humans de-evolved.

100,324 BC=start Forerunner/Flood War.

100,000 BC=Forerunner, named Didact, activates the Halo Array from the Ark, Killing all organic life in the Milky Way Galaxy, all life over 2.5 pounds.

2012 AD=start of the 2nd American Civil War.

2014 AD=end of 2n American Civil War. Texas secedes to form the Independent Republic of Texas. (IRTX)

2016 AD=start of World War 3.

2019 AD=end of World War 3.

2050 AD=first colony on the Moon. First man on Mars.

2100 AD=the UN votes to make a new Branch: the United Nations Space and Colonization Branch. (UNSCB)

2150 AD=the first of several inter-colonial civil wars, between the colonies on Mars, Europa, Titan, and others.

2156 AD=the UN decides to add a military component to the UN: the UNSC Army. UNSC Navy. UNSC Air Force. UNSC Marine Corps.

2188 AD=an uprising on Mars, shows that a military cannot fight battles, or win wars if the politicians are calling the shots. The UN votes for the UNSC to become a separate identity.

2300s AD=Humanity's first FTL device, called the 'slip-space' drive is created.

2400s AD=A slow burning rebellion between the Inner Colonies [those in the Sol system] and the Outer Colonies.

[2498 AD=Sangheili Ny 'Kle Vandan is born.

2525 AD=First Contact with an alien species on the Outer Colony planet of Harvest. It does not go well. Soon the planet communications stop. The UNSC sends 3 Destroyers, each armed with the new MAC gun. The ships are only in real space for less than 20 seconds before returning, only one ship survived long enough to turn around to flee. It was heavily damaged by High-Power DEWs. (Lasers)

June 12th, 2525 AD=only 3 days after first contact, the alien alliance called the Covenant, declares Wars on all of Humanity. Start of the Human/Covenant War.

March 3rd, 2553 AD=End of the Human/Covenant war. The Sangheili, lead by Thel 'Vadan-the Arbiter, take a 'Permanent Oath' vowing to always stand beside Humanity, and to aide and defend Humanity if attacked. Humanity, lead by Sir Lord Hood, accepts and gives a similar Oath.

2557 AD= Ny 'Kle Vandan, along with his cousin, the Arbiter, finds Master Chief, two elites, some SPARTAN4s and the Forerunner: Didact. They are attacked by the Precursor 'Timeless One'. Ny 'Kle is fatally injured by the 'Timeless One'; allowing Chief to use his scorpion tank to bring down the wall, killing the Precursor. The group; dragging Ny 'Kle against his will- to the rescue ship, as the nuke blows, destroying the Hive of Elite born-Xenos.

2559 AD=the rescue ship returns to Earth. There is celebration for the return of Master Chief and the Arbiter; and a funeral for Ny 'Kle Vandan.

2560 AD=the UNSC and RoS, start building ships to defend themselves from the Covenant. The real reason is that ONI has found rumors of the "Precursors" that the Arbiter, Chief, Cortana, and the two Elites that came with them talk about.

2584 AD=ONI was right. A group of Precursor ships, each over 40km long appear in Earth Orbit. The Orbital MAC Platforms work beautifully, the cooperation of Humans and Elites awesome. But more ships appear, over Elite planets, Human planets, and military planets.

2616 AD=the war is over. The UNSC, RoS, and the New Covenant, are victorious. The Precursors leave, sending a message: they will return, their fleets will darken the skies of every world. The Govts decide that the present way of military structure was not enough. The UNSC and RoS are disbanded. The 'United Human Government' and 'Sangheili Federation' are formed. Those unwilling to change to the new protocols are exiled. The UNSC loyalists and the Republic of Sangheilios (RoS) are loaded onto their ships, relics from the human/Covenant War (2525-2553). Notably the RoS S-CAS class Assault Carrier 'Shadow of Intent', the UNSC Infinity(salvaged from Requiem by ONI in 2589), and the RoS S-CCS Super Cruiser 'Seeker of Truth' the antiqued flagship of the Arbiters Fleet.

2634 AD=the Precursors attack. Thousands of their ships are reported, along with tens of hundreds of thousands of other ships, ships that behave more like the 'Scarabs' of the Human/Covenant War; living thing(s) inside of, or part of a fighting machine. These ships use a shield system different than Sangheili and Human ships use. These robot ships, named "Reapers" by the Precursors, had shields that were only effective against physical projectiles; the shields had zero effectiveness against the Elites' Plasma weapons. John Sheppard, the Master Chief, deemed a UNSC Loyalist, but also deemed a resource too valuable to exile, died, at New Cairo, Egypt; while in battle against Precursor Commandos. He detonated the Micro-Fusion Battery in his MJOLNIR armor. The blast was equal to 75 tons of TNT. He died at age: 117.

2698 AD=after a civilian lead Coupe, the UNSC is re-formed. Very soon after, a similar Coupe is launched on Sangheilios, being successful, the RoS is also re=formed.

2729 AD=the last of the ships are through the Portal. The Combined Fleets of the UHG/UNSC, the SF/RoS, and the New Covenant, which numbered in the tens of thousands, have been reduced to 14 space worthy ships. The Reaper Fleet, which numbered in the tens of Millions, have been reduced to a few hundred. The Precursor Fleet which numbered in the Thousands (Remember, each Precursor ship is longer than 40km), and have been reduced to less than 500 hundred. The RoS S-COS class Super Carrier, 'Were It So Easy', Shipmastered by Ulzoac 'Vadan, crashes his ship into the Forerunner structure; smashing, crashing, the Eons old relic, denying the Reapers and the Precursors access to the Ark.

2785 AD=the original UNSC and RoS Loyalists that were exiled, have established stable colonies. No contact with anyone, with the exception of their exiled counterparts, no Reapers. No Precursors. No Combined Fleets. Nothing.

3484 AD=The Reapers have Destroyed the UNSC Exiled Colony, the colonies' MAC gun destroying a Reaper Battle Ship. Tha RoS Colony sent help, but it arrives too late; all that remains are the smoking, cratered planet. And the cleanup crew of Reapers. Very Soon, there are no more Reapers.

4448 AD=The Reapers are tasked with the duty of maintaining the Milky Way Galaxy. Using reaper Technology, that is, Primitive Precursor Technology, the Reapers build the Mass Relays, the Citadel, and the other devices needed to harvest the advanced organic brain material every 50,000 years.

The Precursors realized that the development of AIs in the Human, Sangheili, and New Covenant, was one of the main reasons for their defeats, and lead to the escape of the humans, elites, and others, through the Forerunners sub-dimensional Portal to the extra-Galactic super station, called the Ark.

The Precursors set the Reapers to cull the galactic civilizations from the galaxy to insure that when the Precursors do return to the galaxy, there will be minimal, if any AI resistance.

37 million years later...

Humans have re-emerged. So has many other advanced species. The whole time, the IRoS, (the Independent Republic of Sangheili) have watched and listened, developing a system to extend one's life span indefinably (though most choose not to, and choose to live a normal life) and have helped the promising species to advance beyond the technological vise that the Reapers have enforced...

Alliance Year: 2182 AD=the first human specter, Commander John Sheppard (yes he's related to the MCPON-117), tracks down the rogue specter Saren. The Commander and his crew, aboard their primitive stealth vessel, called the 'Normandy', found Saren, tracked him to the ancient forerunner shield-world- now called 'Ilos'. Meanwhile, the Reaper, called Sorveringe, attacked the Citadel, and the human fleet, somehow using primitive versions of the Reapers already primitive Precursor weapons, managed to kill the Reaper Dreadnought.

Alliance Year: 2182 AD=Sangheili operators detect the presence of the Reapers personal thralls, called the Collectors. Before the Sangheili Reaper Patrol Forces can respond, the human ship 'Normandy' enters the system. The Collector "Cruiser"(though to the Elites, it's more like a frigate) attacks the Normandy. The Normandy, outfitted with the latest in human re-designed Reaper Technology (anything that uses Technology incorporating Mass Effect, is considered Reaper Tech, and if its Reaper tech, then its considered primitive Precursor Technology), is no match for the Collector's very primitive directed energy weapon (aka a laser). That technology was given to the Protheans, before they were defeated by the Reapers. The Sangheili Patrol can only sit and watch as the human ship is destroyed. It is however, the Patrol that sends the distress signal.

Alliance Year: 2188 AD=the human john Sheppard and the new ship, 'Normandy 2' find the disabled Reaper orbiting Mnemosyne that the UNSC Exiled Colonies' MAC gun killed. Soon after, the Normandy travels to the Reaper built galactic center Reaper building station, and destroy it.

Alliance Year: 2188 AD= Earth is under attack by Reaper Forces. The IRoS is contacted by the "Old One". : The IRoS is to assemble the Fleet and travel to Earth. The "Old One" himself, is coming to do battle with the Ancient Enemies…