Omega (Final Fantasy X)

Omega was a monk of Yevon 700 years prior to the events of Final Fantasy X. The maesters of Yevon branded Omega a traitor after he rebelled and exiled him off of Spira's mainlands onto some small island ruins. Omega's hatred for Yevon grew so great and intense that when he died, he transformed into the fearsome monster known as "Omega Weapon", as well as spawning the lesser beast known as "Ultima Weapon".

The islands he was sent do die on were titled the Omega Ruins.

Final Fantasy X

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Lady Yuna traveled to the Omega Ruins during her Pilgrimage in Final Fantasy X. Here, the superbosses Ultima Weapon and Omega Weapon threaten the party after living in the ruins for the 700 years. The party defeat the two.

Final Fantasy X-2

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The Gullwings encountered the Weapons several times again in Final Fantasy X-2. The Sphere Hunters, Yuna, Rikku and Paine encounter Ultima Weapon and Omega Weapon at the Farplane. The Farplane had become their resting place after their defeat in the Omega Ruins. Once defeated, the Weapons return to the Farplane and can be fought again like normal encounters.