|Final Fantasy X Original Creation|
|すべてを超えし者 (Subete o Koeshimono)|
|Sensor||Immune to Sensor.|
|Common Steal||Lv. 4 Key Sphere|
|Rare Steal||Warp Sphere|
|Common Drop||Warp Sphere|
|Rare Drop||Dark Matter|
|Weapon Drop||Break Damage Limit|
|Armor Drop||Break HP Limit|
|Abilities||Attack, Armageddon, Ethereal Cannon, Ultra Spark|
|Resistant to||Zanmato (Lv. 5)|
|Immune to||Silence, Sleep, Darkness, Poison, Petrification, Slow, Zombie, Power Break, Magic Break, Armor Break, Mental Break, Threaten, Death, Provoke, Sensor, Scan, Gravity, Delay, Eject|
Nemesis is a superboss in Final Fantasy X created by the old man who runs the Monster Arena in the Calm Lands. Nemesis is an Original Creation monster and a color variation of Omega and Ultima Weapon. Often nicknamed "Omega Gold", it is the most durable and most challenging enemy in the original versions of the game (Penance and arguably some of the Dark Aeons in the PAL and International versions of the game are harder), with 10,000,000 Hit Points and an array of spells and attacks that can instantly kill even the highest-level, best-equipped parties.
Overdrives will cause Nemesis to Counter with Ultima. His Ethereal Cannon is a non-elemental magic-based attack against one character; and Ultra Spark will inflict many status ailments including Curse and Power Break on the party. Nemesis's ultimate attack is Armageddon, which hits all characters for 99,999 damage. The latter is graphically identical to Omega Weapon's Nova.
For an easy win, the player should use three party members with fully powered Celestial Weapons, not including Yuna. The party should use nothing, but Quick Hit to deal massive damage before Nemesis even gets a chance to act. When his turn is about to come up, the player should switch in Yuna and summon.
The Aeon will get in one or two attacks before being killed, at which point the original party can return and resume Quick Hit. Nemesis will run out of HP long before Yuna runs out of Aeons. This strategy guarantees a win without the party taking a single HP of damage. Shell can be used if Armageddon, Ethereal Cannon or Energy Spark are causing problems.
Once Nemesis is defeated the player will receive the coveted Key Item, Mark of Conquest. Despite the bragging rights that come along with such an item, Nemesis can be fought an unlimited amount of times provided the player has enough gil.
Despite Nemesis's rare steals (Level 4 Key Sphere, Warp Sphere), stealing from it is not exactly straightforward, as it will counter with Ultima, doing extreme damage to the whole party. However, Mug does not cause it to counterattack.
- See also: Nemesis#Etymology.
The Japanese name for Nemesis, (すべてを超えし者, Subete Wo Koeshimono?) means "he who hath transcended/conquered all". His name is Il Supremo in Italian, meaning "the supreme", Summum in Spanish, which means "the top, the max" in Latin, Être Suprême, lit: Supreme One, in French, and Deus in German, which is Latin for "god".