You can unlock Catastrophe in the Monster Arena by unlocking six Area Conquest fiends.
HP: 2,200,000
The battle against Catastrophe has two parts: the first with its shell closed and the second with its shell opened. With its shell closed, it will use an attack called “Toxic Cloud,” which will inflict Confusion, Curse, and Poison. Make sure that your party members has the 
Ribbon auto-ability or at least be sure that they have the Confuseproof auto-ability attached.
Make sure that each of your characters have the Auto-Phoenix auto-ability and that you have a heavy stockpile of 
Phoenix Down. Consider also using 
Auto-Life as well to keep your party members alive. Aside from that, there isn’t much strategy involved…
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:
Gambler’s Spirit (common)
Lv. 2 Key Sphere (rare)
Drops:
Designer Wallet (common)
Dark Matter (rare)