Planet Earth is the last planet in this universe under the occupation of Dark Forces, the last relic of galactic wars that raged throughout the galaxy for millions of years. As the Galaxy was being liberated from the grip of Dark Forces, the Forces of Light have been evolving from a military force created in the urgent need to defend basic liberties of sentient beings towards a harmonious galactic and cosmic society. As beings within the Galactic Confederation have evolved spiritually and made their alignment and union with the Ascended Masters, they have discovered an inner codex that regulates all inter-relationships between beings of Light and their relation towards the Dark Forces and occupied planets.
A political-economic pact for collective colonial security, the Alliance is the central galactic institution of human society. The Alliance gained associate membership to the Citadel Council in 2165 and full membership in 2183, with Ambassador David Anderson representing humanity.
That same year, an accident at the Singapore International Spaceport exposes humans to element zero in dust form. 30% of the children born after that element zero exposure have cancerous growths. Some of those children, however, will become biotics.
The turians see humans trying to activate dormant mass relays, which is forbidden by galactic law, so they attack humanity. The war lasts three months. During that time, turians occupy Shanxi, a human colony. Humanity evicts them from the planet one month later.
In 2183, the events of Mass Effect 1 happen. At the time, humans have reconciled with turians, leading them to work on a new spaceship: the Normandy. Humanity is trying to get a place on the Citadel Council and want a human Spectre. Spectres are elite agents who only answer to the Citadel Council. Shepard is the candidate chosen, and is sent on a mission with a turian Spectre called Nihlus Kryik.
The asari and salarians make contact with the volus. As the volus are great at dealing with economics, they are commissioned by the Council to draw up the Unified Banking Act. A common currency, named the credit, is established and is now found in all galactic economies.
From 1CE to 300CE, the Rachni Wars happen. The rachni are smart hive-minded insects. A Citadel expedition discovers their existence by opening a dormant mass relay that leads to their star systems. This explains, in part, why opening dormant mass relays is forbidden and why the turians attacked the humans when they did so years later. Indeed, the rachni begin a war with the galactic community. In 80 CE, the salarians find the krogan and uplift them.
The krogan and their homeworld Tuchanka are barely out of a nuclear age (from 1900 BCE). They formed clans that are at war with each other. The salarians made krogan a spacefaring species, and used them as soldiers against the Rachni. It proved to be successful, as krogan were able to survive in rachni worlds and destroy the rachni in their nests. They killed the queens and eggs.
In 300CE, the rachni are extinct. The Council are grateful toward the krogan and reward them with several habitable planets as well as the conquered rachni planets. The krogan grow in numbers, and with their new ability to space travel, they start colonizing new worlds.
In 700CE, the Krogan Rebellions start. The krogan start to annex worlds that were already colonized by other races. The Council asks the krogan to leave an asari colony called Lusia. The krogan refuse. The Spectres, created seven years before in 693CE, are asked to strike krogan infrastructures. This act starts the Krogan Rebellions.
In 710CE, the turians use a salarian-engineered bio-weapon known as the genophage on the krogan. This bio-weapon makes most krogan pregnancies unviable, causing many stillbirths. As a result of this action, the krogan population declines. In 800CE, the Krogan Rebellions officially end. In 900CE, the turians are granted a seat for their part in ending the Krogan Rebellions.
In 2183CE, the events of Mass Effect happen. Depending on the choice Shepard makes, the members of the Citadel Council can either be saved or killed. If the Council dies, they are replaced by new asari, salarian, and turian members by the second game, but may be either entirely human or led by a human in the interim.
After observing that most races create synthetics that end up rebelling against them, the Leviathans create an Intelligence (known as the Catalyst) who has one purpose: preserve organic life. The Intelligence starts doing research on genetic material using pawns. With those pawns, the Intelligence turns against the Leviathans and kills most of them to create the first Reaper, named Harbinger. The Intelligence uses Harbinger to harvest space-faring organic life at the highest point of their evolution, so no conflict between organic and synthetics can escalate, and they create more Reapers. The cycles of regular harvesting begin.
Most species believed that the Protheans created the network of mass relays and the Citadel. Shepard later discovers that the Intelligence used the Reapers to create the network as a way to facilitate travels for the harvest.
In 68 000 BCE, the Protheans are now a spacefaring species. They discover mass effect technology from the ruins of an extinct race called the inusannon. The Citadel becomes their capital and they establish themselves all over the galaxy using mass relays. They assimilate other organic races.
The Prothean Empire later collapses in 48 000 BCE: the Reapers arrived through the Citadel and started to destroy the Protheans planet by planet. Since they had access to all data regarding the Prothean Empire, they could effectively find every planet and every civilization under their Empire. They isolated the Protheans from each other by getting access to the mass relay network. The most primitive of the subjects in the Prothean Empire were left alive, so the cycle could begin anew. Everyone else was wiped out.
A dozen Protheans were awoken by Vigil. They left beacons on other planets hoping to find more survivors. These beacons warned against the Reapers and described Ilos. (One of these beacons would later be found by Shepard.)
On a colony named Feros, Shepard discovers that Sovereign is able to enthrall and control others in a process called indoctrination, which happens after a period of exposure to Reapers or Reapers artifacts. On a world called Noveria, Shepard fights and defeat Benezia, who then confirms that both she and Saren are indoctrinated. Benezia dies as a result of the fight.
Afterwards, Liara finds where the Conduit is and the Normandy heads to Ilos. Vigil, a Prothean VI, talks to Shepard and explains that the Prothean scientists left Ilos for the Citadel in order to alter the signal the Keepers receive. Saren plans to alter it again and use the Conduit to get inside the Citadel with his geth army.
The Alliance fleet tries to counterattack Sovereign while the Council ship is being attacked by the geth. Shepard has a choice to make: save the Council and risk human lives, or risk the Council to concentrate on Sovereign. No matter what Shepard chooses, Sovereign will die and Saren will be destroyed completely.
Mass Effect is an action role-playing game developed by BioWare for the Xbox 360 and then ported to Microsoft Windows by Demiurge Studios. The Xbox 360 version was released worldwide in November 2007 published by Microsoft Game Studios. The Windows version was released on May 28, 2008, published by Electronic Arts.
The game takes place in the year 2183, with the player, assuming the role of an elite human soldier named Commander Shepard, setting out to explore the Galaxy on a starship, the SSV Normandy. The titular mass effect is a form of inertia-suppressing technology, allowing faster-than-light travel.
A sequel, Mass Effect 2, was released on January 26, 2010, and takes place two years after the events that transpired in the first game. Mass Effect 2 also directly uses players' completed save data from the first game to influence events and storylines within the second game, basing certain events and narrative threads on decisions and actions that the player made in the first game.
In addition to the sequel, and plans for a third to complete a trilogy, BioWare plans to release episodic content online to fill in the story between each game, though these episodes are not essential for understanding the main plot line. The first downloadable content package, Bring Down the Sky, was released on March 10, 2008 (with a PC version released on July 29, 2008) The second downloadable content package, Pinnacle Station, was released on August 25, 2009 for the PC and Xbox 360. And in November 2012 for Playstation 3
Although most of the game's screen shots and concept art show the same "default" male Commander Shepard, it is possible for the player to fully customise his or her character's appearance, gender, abilities and even military background.
The game includes six character classes. Each class contains several "talents"; as each talent is leveled, the character either gains stats (extra health, stamina, etc), unlocks new abilities (for example leveling the Shotgun talent unlocks the "Carnage" ability, which allows the character to fire a concentrated explosive blast from the shotgun), or unlocks other talents. Each class also possesses a unique talent with the same name as its respective class; the characters may also have talents tied to their background. Characters who have reached level 20 will unlock a "Rogue VI" side-mission on Luna (Earth's moon) in the Sol System, upon the completion of which the player is allowed to choose a new specialist class, which in turn unlocks a new talent bar. The specialist class the character is offered depends on the base class.
When characters are first created, six classes are available: Soldier, Engineer, Adept, Infiltrator, Sentinel, and Vanguard. Soldiers are the most skilled with weaponry, Engineers make the most use of the omni-tool and tech-abilities, and Adepts are the best at using biotic powers. The other three classes are combinations of the first three: Infiltrators are a combination of Soldiers and Engineers, Sentinels are a combination of Engineers and Adepts, and Vanguards are a combination of Soldiers and Adepts. While the combination classes don't have the focus of the main classes, they are versatile and offer unique game-play opportunities. (Vanguards, for example, have access to half of the soldier skills and half of the Adept skills).
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