A thousand years it has been since a challenger stood before me. Show me the power you possess. Defeat me if you can.
Omega is a superboss in the Dawn of Souls and succeeding versions of the original Final Fantasy. It is found on Floor B20, the final floor of the Lifespring Grotto, and either it or Shinryu must be defeated to complete and leave the dungeon.
Omega is arguably the hardest boss in the Dawn of Souls and following version of the game, with only Shinryu providing any real argument. It has the highest Defense stat so initially physical attacks will be useless. Omega's physical attacks do hefty damage and can KO even high-leveled characters in a single hit. His Wave Cannon move also hits the entire party for 200-300 damage.
It is recommended for the party to be at level 60 or higher. Having both a Black Wizard and White Wizard is helpful, and using the Giant's Gloves as an item on any physical attacker makes them much more useful in this battle.
The Black Wizard should start out by using Temper and Haste on all of the party. If the party has a Red Wizard, s/he should help with Tempering and Hasting. After the party is buffed up, the Black Wizard should either use Thundaga or use the Judgment Staff received previously from Atomos for free castings of Flare. The melee units should not even think about attacking until they have Temper cast on them at least twice and have cast Saber on themselves using the Giant's Gloves.
The White Wizard should be using Healaga or Healara every single turn, because Omega frequently uses Wave Cannon. Several Ethers to replenish MP are likely required, because this battle takes a long time as a result of Omega's astronomical HP and Defense (an attack will be lucky to break 1,000 damage).
In spite of his high defenses, Omega is manageable. Wave Cannon is powerful, but nothing that cannot be recuperated with Healaga. Omega does use Earthquake and its physical attack can hit for 500 - 1000 damage on one character, but if the party keeps healing with the mages and attacking with the warriors, Omega will eventually be defeated.
Omega (capital: Ω, lowercase: ω; Greek Ωμέγα) is the twenty-fourth and last letter of the Greek alphabet. It is synonymous with a set's end or limit.