Omega (Final Fantasy XV)

Omega is an optional superboss in the Insomnia Ruins dungeon exclusive to the Royal Edition expansion and the PC version of Final Fantasy XV. It is a warmech associated with the ancient civilization of Solheim, entering the battle arena through a portal identical to the platforms in various Solheimian ruins, such as Costlemark Tower and Pitioss Ruins. The Ω-Files the player can discover chronicle the story of Omega's discovery as an ancient magitek weapon. The party calls its appearance from a portal "interdimensional nonsense".

Omega is homage to the boss's previous appearances in the series, being on the same level as the boss in Final Fantasy V and yielding a trophy item, Omega Badge, when defeated. It being an ancient war machine built to kill gods is also homage to its origins, but also fits into the story of Solheim.

Battle
Omega is by far the toughest enemy in the game mainly due to its 99% damage resistance to normal weaponry and elemental magic, except Lightning (80% damage resistance) and Light (absorbs). It is immune to Arcana magic from the Ring of Lucii, boasts extremely high stats, and its attacks can easily deal 9999 damage even on a max-level party with endgame equipment. Even the Magitek Exosuits cannot block Omega's attacks.

After Omega reaches a certain HP threshold (or if the player attacks its antenna), it will temporarily enter a "berserk mode" where it will move and attack faster, but loses its 99% resistances to normal weapons.

A special Cross-Chain animation sometimes activates for Omega.

It drops the Rare Metal accessory when defeated, which gives Noctis a colossal strength boost and allows him to break the damage limit without Armiger Unleashed, but in exchange severely reduces his defense and cuts his maximum HP by 90%.

Strategy
Omega's 99% resistance to normal weapons forces the player to use the royal arms, but even this will take a long time due to its exceptionally high defense stats. Powerful lightning magic such as Quincast: Thundaga or Electron can be used as well, but they must have very high potency to deal sufficient damage due to its 80% damage resistance.

Omega's attacks, while few, are deadly and capable of one-shotting the party. It would be safer to use the standard Armiger over Armiger Unleashed, as in the latter Noctis can fall in the Danger state, and because Omega absorbs Light damage. When in Armiger, the player can attack its head to try to make it Vulnerable for a Cross-Chain.

If using the higher damage output of Unleashed despite the risks, the Tech Turbocharger accessory hastens the Tech Bar's refill rate so the player can frequently use the Unleashed Techniques making Noctis invincible for their duration. The player can also repeatedly use warp-strikes. After Unleashed runs out, the player can switch to the Armiger Accelerator accessory to quickly fill the Armiger bar.

When Omega is "berserk", using regular weapons and Ignis's Overwhelm are viable.

An easy way to win is to character-swap to Prompto with the Clever's Talisman equipped (so he has infinite ammo) and position him between buildings so that Omega cannot reach him, and then use the Rapidus SMG on its antenna to make him berserk and lose its 99% damage resistance to firearms.

Musical themes
The music played when battling Omega is a new orchestral arrangement of the Final Fantasy V tracks "Battle 1" and "Lenna's Theme".