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Aurora Unit 313 is an antagonist in Metroid Prime 3: Corruption, appearing as the final boss of the game and the series overall. The unit is an organic supercomputer that was created by scientists of the Galactic Federation and was later stolen by the Space Pirates and used by Dark Samus on the planet Phaaze, the source of all Phazon.
Metroid Prime 3: Corruption
Along with the other Aurora Units, AU 313 was constructed at least 20 years prior to the events of Metroid Prime 3: Corruption, by the Galactic Federation.
During the events of Corruption, Aurora Unit 313 and the other Aurora Units had become corrupted by a Phazon-based virus, which was thought to be caused by the Space Pirates. The Space Pirates had soon attacked the G.F.S. Valhalla, the ship that carried AU 313, hoping to steal the unit from the Federation, which had been taken to the planet Phaaze, where it would be used by Dark Samus as a way to spread Phazon across the galaxy and soon the universe. Dark Samus and the Space Pirates kept the unit in the heart of the planet, where it gained the ability to control the planet and the production of Phazon.
After destroying the Leviathans on the planets Elysia, Bryyo, and the one on the Pirate Homeworld, which were planets targeted by Dark Samus, Samus Aran traveled through a Leviathan wormhole that led her to the Phazon planet. Once reaching the planet, Samus prepared to land on the surface but not before witnessing a space battle between the Galactic Federation and the Space Pirates.
When Samus reached the heart of the planet, she found Dark Samus inside and the two quickly engaged one another. After defeating her doppelganger once again, AU 313 emerged from the ground and Dark Samus merged with it, prompting Samus to fight the unit. When the unit was assumed defeated, it fell to the ground, revealing a weak point that requires Samus' Grapple Lasso, and after pulling on the weak point, AU 313 became unattached from the cord and began flying around. After defeating it a second time, another weak point became visible, allowing Samus to finally destroy the AU. Once AU 313 was destroyed, a chain reaction was caused by the symbiosis of Phaaze and the AU, and the planet was ultimately destroyed by an explosion, ending Samus' fight against Phazon for good.
- Although Dark Samus may be seen by many as the Bigger Bad of the Metroid Prime tetralogy, AU 313 is actually the Bigger Bad, being physically attached to the planet that generates Phazon and that it has the ability to fire as many Leviathans as possible.
- 313 shares many similarities with Mother Brain, the main antagonist of Super Metroid, as 313's appearance resembles the design of a brain and the fact that 313 has something that resembles an eye, which Mother Brain has.