Nemesis
Nemesis is the final and most powerful creation of the Monster Arena, a colossal fiend that serves as the ultimate superboss of the original version of Final Fantasy X. It only becomes available after you have completed the entire fiend capturing side quest and conquered every other arena creation, making it the closest thing the game has to a final exam for a fully developed party.
Unlocking Nemesis
You can unlock Nemesis in the Monster Arena by capturing all 10 of every fiend that you can find across Spira. You must then also defeat all the various Monster Arena creations. This includes all the Area Conquest, Species Conquest, and Original creation fiends.
Once completed, you must leave the Monster Arena area and return, and you will find Nemesis as the last entry under the Original Creations section.
Preparing for Battle
Nemesis is the strongest and most difficult fiend that you can battle in the Monster Arena. You will need to power level your characters, obtain their Celestial Weapons, and most likely max out their stats. Check out the following pages to get your party ready:
Tips and Tricks
Battling certain fiends at the Monster Arena to quickly level up your characters.
Tips and Tricks
Methods and tips for maxing your character’s stats as they progress through the Sphere Grid.
Tips and Tricks
A guide to crafting and customizing strong armor for your characters to complete the endgame content.
Obtaining the Celestial Mirror, which is the first step to obtaining the Celestial Weapons.
The Battle
| Stats | |
|---|---|
| HP (Overkill) | 10,000,000 (99,999) |
| AP (Overkill) | 55,000 (55,000) |
| Gil | 0 |
| Elements | Absorbs Fire, Ice, Lightning, Water, and Holy |
| Vulnerable To | None (immune to virtually all negative statuses) |
Nemesis has several high-powered moves in addition to its regular physical attack:
- “Ethereal Cannon” targets one of your party members for a ton of damage.
- “Ultra Spark” hits all of your party members for a ton of damage while also inflicting several negative status effects.
- “Armageddon” is its ultimate attack, hitting all of your party members for 99,999 damage each.
You’ll notice that the specific damage amount and the status effects are not listed… this is because it is unimportant. Nemesis’ attacks are likely to KO your characters nearly every time its turn comes up. While there are some work-around ways to defeat Nemesis in earlier, pre-HD versions of the game, in the more modern remakes (PS4 and Nintendo Switch), using 
Auto-Life is practically a necessity.
Make sure that your characters have strong armor that includes 
Auto-Haste. It can also include Auto-Protect and Auto-Regen, but these do not have as much importance during this fight due to the number of times your party members will be KO’d. Ribbon is also unnecessary because, while “Ultra Spark” will inflict several negative status effects, it will also KO your party members.
Don’t overthink this battle. Just refresh Auto-Life each time your party members are KO’d and use 
Quick Hit to get in as many attacks as you can before Nemesis’ turn comes up.
If you are playing one of the International or HD Remaster versions of the game and are still hungry for a challenge after Nemesis falls, the Dark Aeons and Penance are waiting for you:
Side Quests
A guide to battling Penance, the ultimate superboss of the International and HD Remaster versions of Final Fantasy X.
Descriptions
| Ability | Description |
|---|---|
| Sensor |
“Immune to sensors.” |
 Scan |
“Immune to scans.” |
Steal:
Lv. 4 Key Sphere (common)
Warp Sphere (rare)
Drops:
Warp Sphere (common)
Dark Matter (rare)
Achievement/Trophy
You will receive the 
Overcoming the Nemesis Achievement/Trophy once you have successfully defeated Nemesis.
