- See also: Omega Weapon (Enemy).
- "The roiling skies let loose a vile beast without a soul: Omega was its name."
- —Book in Final Fantasy V
Omega is a silver steel robot with a round body and four spider-like legs emerging from the sides. It has no head, and the central body is dominated by a large, yellow, pupil-less eye. Its signature attack, Wave Cannon, does heavy non-elemental damage to the party. Omega frequently uses the attacks Earthquake, Flamethrower, and Maelstrom, and otherwise uses technological-themed attacks.
As with other recurring powerful bosses, like Shinryu or Gilgamesh, it is hinted that several of the "Omegas" that appear in the series are actually the same entity across several games, traveling between worlds via the Interdimensional Rift. According to the Urutan-Yensa bestiary entry in Final Fantasy XII, Omega Mark XII was created by an inventor for the request of an unknown patron to defeat some kind of monstrous Wyrm. After giving birth to a brood of Weapons, the original Omega escapes after Farrister and his patron had a falling out. Dissidia Final Fantasy refers to Omega as a powerful machine created by an ancient civilization to destroy another powerful entity, and that it now travels dimensions aiming to complete this objective. In Final Fantasy XIII-2, Omega was sealed away within another dimension due to its power and need to destroy everything and everyone around it.
All this may suggest that the incarnations of Omega appearing across the series may be either the same entity traveling between worlds, or they are shades of the original Omega, as the Final Fantasy XII information on Omega implies, that were sent out to different worlds by the original Omega that created them. Based on Final Fantasy XII stating that Omega was meant to destroy a powerful Wyrm (or Dragon), and Dissidia stating that Omega was created to destroy a "massive power," it may be that Omega's objective is to destroy Shinryu, a powerful dragon that often appears parallel to Omega as another superboss and who also has the power to travel between dimensions. This is somewhat supported by Shinryu's museum profile in Dissidia 012 Final Fantasy, which mentions that Shinryu travels the Rift in search of Omega.
- Main article: Omega (Final Fantasy)
Omega appears in the GBA/PSP/iOS versions of the original Final Fantasy. Appearing in Lifespring Grotto, it is one of two bosses that can be fought at the end of the dungeon, the other being Shinryu. It uses a powerful attack called Wave Cannon to hit the entire party and has very high defenses. Upon defeating it, the party wins the Murasame. Its sprite in the Dawn of Souls release is a modified sprite of Omega from Final Fantasy V, while in the 20th Anniversary and the iOS release, the sprite is of much higher quality.
- Main article: Omega (The After Years)
Omega appears as one of the bosses representing Final Fantasy V. It can be found wandering around B14 in the Depths and can be avoided if the player wishes. It can counterattack with its special Omeguard, which reduces all damage it takes to a single digit for the next attack or two. Its normal attacks are powerful, and include its signature Surge Cannon, which can do several thousand damage to the entire party. It drops the fabled Hero's Shield upon defeat.
- Main article: Omega (Final Fantasy V)
Omega's first appearance in the series, it appears in the Interdimensional Rift wandering a small plateau outside a save point. Omega can be avoided with careful stepping, and is entirely optional. In battle it uses powerful attacks and is very fast, but is vulnerable to Stop - although Stop wears off quickly, this still gives Omega a large weakness. Defeating it earns the party the Omega Badge to show proof of their victory. In the Advance port the upgraded Omega Mk.II appears in the new Sealed Temple area with six copies of the original Omega roaming nearby.
- Main article: Omega (Final Fantasy VII)
Omega is known as the ultimate Weapon. But unlike the other Weapons that were designed to protect the Planet, Omega appears when the Planet is in jeopardy and it gathers the Lifestream to take it and safeguard it on another world, leaving the old planet to die. It is summoned by Weiss under Hojo's control in his attempt to take control of the Planet, and is destroyed by Vincent Valentine.
- Main article: Omega (Final Fantasy XI)
Omega appears in Final Fantasy XI, more in-line with its original Final Fantasy V appearance than its previous bio-mechanical appearances. It appears in Chains of Promathia Mission 6-2 and its power increases as it takes damage. It does not turn to attack enemies but merely swats them with the nearest limb. Although it is still very strong, Omega Weapon is small enough to fit on an airship. A prototype known as Proto-Omega awaits those at the heart of Apollyon and is much more powerful. A third variant, known as the Pantokrator, has been seen in Abyssea - Uleguerand.
- For the battle information, see: Omega Mark XII
Omega Mark XII is described as a war-machine with weapons stronger than any modern ones, and is located at the Great Crystal. It is only available to fight once the Hunt for the Elite Mark Yiazmat has been accepted; if the party visits its area beforehand, it will instead appear in a dormant state, in the shape of a giant coffer, and it cannot be roused.
Defeating it earns the party the Omega Badge, one of the Loot items needed to acquire the Wyrmhero Blade. Omega originally had 10 million HP in the Japanese release of the game, but was weakened to a mere 1 million for the North American and PAL releases. Despite its HP being surpassed by other superbosses within the game, Omega Mark XII has the highest strength, defense and magic power, as well as being the only Level 99 boss in the entire game.
- Main article: Omega (Final Fantasy XIII-2)
Omega appears as an optional DLC boss. Defeating him, as with other monsters, allows the player to recruit him as a party member. Omega is capable of Flamethrower, Missile and its signature Wave Cannon.
- Main article: Omega (My Life as a King)
Omega appears in Final Fantasy Crystal Chronicles: My Life as a King as the 50th floor boss in the optional dungeon Infinity Spire. He uses an attack called Wave Cannon that will hit every Adventurer that is inside Infinity Spire, even if they are not fighting him. Defeating Omega rewards one of the Adventurers who survived the battle with the Omega Symbol, a level 50 necklace that adds +27 to all stats.
- Main article: Omega Slave
In Final Fantasy Crystal Chronicles: The Crystal Bearers two Crystal Armors named Omega Slaves by their goblin worshipers can be encountered in the interior of the Aerial Prison as optional field bosses.The duo were once secret prototypes of the Lilty Kingdom to develop an ultimate weapon powered by Crystals but after the fall of the prison, monsters snuck into the prison's secret lab and stole the new weapons that had been developed.
- "A soulless entity from a far away sky. Created by an ancient civilization as a machine capable of utter destruction, no one is certain for what purpose it was built. One source suggests it was created to eliminate some other massive power. With its creators long gone, it traverses dimensions, aiming only to complete its objective."
Omega appears as a strong summon in Dissidia Final Fantasy. When summoned, it repeatedly reduces the opponent's Bravery by half during a certain period of time. The artwork used for the summon is from Final Fantasy V. Omega can be obtained in the second stage of the Inward Chaos storyline.
Aside from Omega's summon appearance, it is also mentioned in the Cosmos Reports and is identified by name as a weapon of destruction used in war with the state of the narrator, along with summoned monsters. According to the reports, Chaos defeated the summons and Omega and sealed them away.
Omega is also the name of a Ghost Card bearing the Final Fantasy V Omega Player Icon. Omega is a Level 100 Exdeath, and has the Purple Gem and Omega Badge to be won through battlegen, the latter a reference to the item won upon defeating Omega in Final Fantasy V. The quote on the card, "Roiling skies let loose a vile, soulless beast: Omega was its name" is a slight paraphrase of a book in Final Fantasy V that describes Omega and Shinryu.
Omega returns as summon with the same function as in the previous game. It can be purchased from the secret Moogle Shop within the Land of Discord during Scenario 000 for 1,500 KP. The Reports also expand on his background in the Dissidia universe.
Omega appears as a superboss in the game.
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Omega appears as a boss in Final Fantasy All the Bravest.
- Main article: Omega (Chocobo Series)
Omega appears in Chocobo's Mysterious Dungeon 2 as an enemy and in Chocobo Tales as one of the five hidden promo cards.
- Main article: Omega (Final Fantasy: Unlimited)
Omega is an entity of massive destructive potential in the anime, Final Fantasy: Unlimited. Long ago, it was split up into various different body parts, which now roam Wonderland hunting for their "brothers". Some parts have crystallized and can be easily captured, while others have become humanoid in shape. The character Clear is a piece of Omega, his heart. Earl Tyrant desires to recombine Omega to use its vast power for his own.
Omega's name comes from the last letter of the Greek alphabet "Ω", commonly representing the end or limit of something, such as the concept of "alpha and omega".