You can unlock Fenrir by capturing three of each Wolf/Lupine-type fiend, which includes each of the following:
- Dingo (Besaid)
- Mi’ihen Fang (Mi’ihen Highroad)
- Garm (Djose Road)
- Snow Wolf (Macalania)
- Sand Wolf (Bikanel)
- Skoll (Skoll)
- Bandersnatch (Mt. Gagazet)
HP: 850,000
Fenrir is similar to other Lupine/Wolf-type fiends in that it can be difficult to hit for characters without high Accuracy and Luck stats. It has two tricky attacks to watch out for: Fangs of Chaos, which will reduce a party member’s HP by 93.75% and will inflict the Confusion status effect, and Fangs of Hell, which will instantly KO a party member.
The best strategy is to use 
Hastega or have your characters equipped with 
Auto-Haste on their armor. Aside from that, no additional strategy is required.
You should consider power leveling your characters and obtaining the Celestial Weapons. Check out the Advanced section of the Tips and Tricks for more information. With properly leveled characters, this fight is pretty straightforward.
| Ability | Description |
|---|---|
| Sensor |
“Immune to sensors.” |
 Scan |
“Immune to scans.” |
Steal:
Chocobo Feather (x2) (common)
Chocobo Wing (rare)
Drops:
Agility Sphere (common)
Dark Matter (rare)