Gorea

Gorea is the final boss of Metroid Prime: Hunters.

It is a powerful being that invaded the Alimbic Cluster millennia ago, as a shapeless gas. It assumed the form of a gigantic, three-legged Alimbic and began destroying the Alimbic race. Gorea not only resisted the weapons used against it, but it seized and copied them, using the Alimbics' own technology against them. In a last, desperate attempt to defeat it, the Alimbic Order used a device called the Seal Sphere to trap Gorea. As an extra precaution, they put the Seal Sphere in the Oubliette and used the Alimbic Cannon to send the ship into the Infinity Void. Since the Seal Sphere used the Alimbics' psionic energy, this caused the race to go extinct in the physical world.

Thousands of years later, Gorea sent out a telepathic message, using the lure of a so-called Ultimate Power to draw seven hunters to the Alimbic Cluster. It hoped that the hunters would free him in their search for the power; its plan almost succeeded, as Noxus, Weavel, Trace, Spire, Kanden, and Sylux together destroyed the Seal Sphere's casing. Gorea then attacked the hunters, stealing their weapons.

Battling Gorea
Gorea challenged Samus in its old form of a monstrous Alimbic in the lower levels of the Oubliette. It cycled between the six weapons it had stolen from the hunters. However, its shoulders became vulnerable to the antithesis of the weapon it was using at any one time. If one shoulder accumulated enough damage, Gorea would lose that arm, but regrow it in a few moments. If Samus successfully destroyed both arms, Gorea would try to regenerate by floating in the air and drawing energy from the Seal Sphere. At this point, Samus could attack the Seal Sphere to damage Gorea with whatever weapon she had used to destroy its arms. Once Gorea accumulated enough damage, it appeared to be destroyed.

Gorea 2
In actuality, Gorea had a second form. Samus could only find and battle this form if she shot the six panels on the wall of the prison she fought the first form in with their corresponding weapons, in the order indicated by the "Alimbic Prophecy" lore scans. After Gorea was defeated, the panels teleported it and Samus to a new arena.

Gorea's second form resembles the first, but it lacks any limbs. It floats around, and is capable of teleportation. The Seal Sphere is free-floating and vulnerable; all Alimbic essence has left the sphere, and Gorea is trying to draw energy from it. It's still Gorea's weak point, but is now impervious to all of Samus's weapons. Shortly after the battle begins, Samus recieves a message from her ship that guides her to the Omega Cannon, located at the bottom of the arena. The cannon is capable of damaging the Seal Sphere, and Samus is soon able to destroy Gorea.