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Catalyst
The Catalyst is the elusive final component deemed necessary to complete the Crucible, the galaxy's superweapon in the fight against the Reapers. Throughout most of the Reaper War in 2186, Commander Shepard chases leads to its location, eventually leading to the discovery of a Prothean VI on Thessia with concrete knowledge about it. Shepard learns from this VI that the Catalyst is the Citadel, though during the final battle on Earth the Catalyst reveals itself as something more. It holographically projects itself as a boy from the Commander's memories and explains as much as it can about its true nature and motivations before letting Shepard decide the outcome that would change the galaxy forever. more...