the next ten years and are used to carry out numerous experiments.
2177 CE - During a recon mission to find a missing colonial pioneer team on Akuze, a unit of fifty Alliance marines is wiped out by thresher maws.
2178 CE - In retaliation for the Skyllian Blitz, the Alliance launches a major offensive against the moon of Torfan and destroys the criminal bases there, mostly populated by batarians. The threat against human colonies from batarian extremists is curtailed. The Alliance tracks several pirate FTL exit vectors over a period of six months using covert monitoring devices planted on Theshaca's moons, leading the Alliance Navy to eight major pirate anchorages. Since the "Theshaca Raids", no ships from the Terminus Systems have entered the Hong system.
The Anhur Rebellions end with the abolitionist forces in power, and the reconstruction of Anhur commences. 2182 CE - Admiral Kahoku of the Systems Alliance begins investigating suspected Cerberus activities.
2183 CE - Humans and turians collaborate on an engineering project co-sponsored by the Citadel Council: an experimental frigate with a prototype stealth system, the SSV Normandy. David Anderson is given command of the ship, and Commander Shepard is assigned as executive officer.
2183 CE The Eden Prime War - The human colony of Eden Prime is attacked by the geth, initiating a wider conflict between humans and geth known as the Eden Prime War. After exposing the involvement of rogue Spectre Saren Arterius in the attack, Commander Shepard and the crew of the SSV Normandy pursue Saren in his search for the Conduit, later revealed to be part of a larger plan orchestrated by the Reaper Sovereign to return its kind to the galaxy. While Shepard follows Saren through the legendary Mu Relay to the Conduit, Sovereign and a geth fleet assault the Citadel. Shepard defeats Saren and the Alliance Navy destroys Sovereign, preventing the release of the Reapers. The Citadel Council is irrevocably changed by Shepard's decisions.
Aria T'Loak interrupts a meeting between Blue Suns mercenaries and the Collectors on Omega, and learns that the Collectors have a dangerous interest in humanity.
One month after the Battle of the Citadel, the SSV Normandy is attacked and destroyed by an unidentified assailant, resulting in the death of Commander Shepard. Later, the Systems Alliance officially declares Shepard "killed in action".
Commander Shepard's body is recovered by Blue Suns mercenaries for the Shadow Broker, who has been hired by the Collectors. Cerberus eventually obtains the body with the help of Liara T'Soni and begins work on the Lazarus Project.
L4 biotic implants are developed.
Two months after the Battle of the Citadel, galactic society is still in flux over the changes to the Council and kept unaware of the true nature of Sovereign, the Citadel, and the mass relays. Cerberus pushes ahead with plans for both the Ascension Project and the quarian Migrant Fleet, but is foiled by the actions of Kahlee Sanders and Paul Grayson. After an attack by Cerberus forces, the Migrant Fleet changes its conservative policy, sending ships away from the Flotilla to look for new homeworlds or possibly a dormant Reaper.
Jacob Taylor and Miranda Lawson prevent an assassination attempt on the Citadel Council by batarian terrorists.
The Systems Alliance dispatches several special forces units to aid the colony of Fehl Prime, which is under attack by Blood Pack forces. Most units are shot down before landing, but Delta Squad survives and defeats the Blood Pack. The Alliance assigns Delta Squad to guard the colony.
2184 CE - The Eden Prime War comes to a close. Although most geth forces in Citadel space were destroyed in the Battle of the Citadel, holdouts yet remain. The Alliance Navy reduces its patrols, relying instead on civilian ships to report any geth activity. Raids are carried out against identified geth outposts, but the conflict is essentially over.
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The raloi of the planet Turvess launch their first space telescope and discover the asari cruiser Avedes in their system. The asari make first contact with the raloi, who are formally welcomed into the galactic community the following year.
The biological weapon EHE, or "exotic humanoid encephalopathy", is used by the human terrorist organization Totenkopf in an attack on Gagarin Station. The Alliance cruiser SSV Manila is deployed to monitor the asteroid Israfil, the supposed origin of the miroorganisms used to produce EHE.
The freighter MSV Estevanico is attacked by Blood Pack mercenaries and crashes into the planet Zanethu. The Alliance crew on board were among the first humans to encounter the vorcha race.
L5 biotic implants are developed.
2185 CE - Fehl Prime is attacked by the Collectors after a Cerberus agent hoping to discover their intentions signals them. Most of Delta Squad is lost during the battle for the colony, but they succeed in disabling the Collector ship. Delta Squad member James Vega chooses to rescue the asari Treeya, who possessed vital intel on the Collectors, leaving the colonists to die aboard the Collector ship when it crashes on the planet's surface.
Commander Shepard is revived and tasked by the Illusive Man to investigate the mysterious disappearances of entire human colonies in the Terminus Systems. Investigation of the attacked colony of Freedom's Progress reveals the enigmatic Collectors from beyond the Omega 4 Relay to be responsible for the disappearances. After assembling a capable team, Commander Shepard uses a captured Reaper IFF to safely traverse the relay and infiltrate the Collector base. Shepard succeeds in eliminating the Collector threat, saving humanity throughout the galaxy from certain destruction.
2185 CE February 10 - A dangerously close flyby of the comet CR1331 Kingu devastates the hanar colony of Belan.
2185 CE March 28 - A coalition of the corporations Binary Helix, Sonax Industries, and Guanghui Solutions invades the krogan and vorcha-populated world of Garvug.
2185 CE April 28 - The Vallum Blast annihilates much of the capital city of the turian colony of Taetrus. In retaliation, Taetrian colonial and Turian Hierarchy troops declare war on the separatist group responsible for the attack.
2185 CE August 11 - The Citadel Council makes first contact with a race of virtual aliens who offer advanced technology in exchange for help maintaining the supercomputers that run their civilization.
Following a lead provided by Cerberus, Commander Shepard helps Liara T'Soni locate the Shadow Broker's concealed base on the planet Hagalaz. The Shadow Broker, exposed as a yahg, is killed. Liara takes control of the Broker's organization, intending to use the Broker's vast information network to aid Shepard's fight against the Reapers.
2185 CE December 7 - Biologists discover the kirik, an insect-like species with biotic capabilities, on the arid world of Ekram. After the kirik exhibit signs of intelligence, experts and officials debate whether or not the kirik should be uplifted.
2186 CE January 12 - An asari exploration team discovers a lost human colony in the Alpha Centauri system. The Systems Alliance links the colony to the forgotten Manswell Expedition of 2070 and establishes contact with the colonists.
Systems Alliance hero Jon Grissom dies. Hundreds of dignitaries attend Grissom's funeral and a memorial plaque dedicated to him is placed in the Jon Grissom Academy. After three years on the run, Paul Grayson is captured by Cerberus and implanted with Reaper technology. Kahlee Sanders and David Anderson attempt to rescue Grayson by persuading the Turian Hierarchy to raid several vital Cerberus installations, but are unaware Grayson's body is now under Reaper control. Once free, the Reapers learn of the Ascension Project and use Grayson to single-handedly attack Grissom Academy, where he is finally killed by Anderson and Cerberus assassin Kai Leng. In the aftermath, Anderson and Sanders decide to study Grayson's body to discover how to combat the Reapers.