Fiend Colony

The Fiend Colony is an optional dungeon in Final Fantasy X-2. It is located on the Mi'ihen Highroad. The player must dispatch a level four or five Chocobo to the highroad from Clasko's Chocobo Ranch during Chapter 5 to access it. Once it returns, Clasko will report a new dungeon has been found.

Monsters roaming the passageways: the Vermin types Creeper, Hug Bug, Hexapod, and the boss King VERMIN!, named after a line of dialogue from Final Fantasy VII, where Barret calls President Shinra a king vermin.

All of the enemies found in the Fiend Colony reappear in Via Infinito and the Vermin type enemies not found here can only be found in Via Infinito, namely the Insect Matriarch and Critical Bug. Scanning the Vermin of the Colony reveals their "complex social hierarchy"...made up of Workers and the King VERMIN!. Perhaps it is complex to Vermin, or too complex for Scan to elucidate.

To travel through the dungeon, the player will need to destroy stone walls with bombs. Near the entrance, the player can find some S-Bombs, and fighting random battles will get more. Some walls cannot be bombed; the game (usually) gives a clue by showing a strong breeze blowing through the cracks in the bombable stone walls, displayed as Yuna's dress hem fluttering when she is near a stone wall. Some walls are stronger than others, requiring the player to use M-Bombs or even L-Bombs. Walls are either 5 point (the great majority), 10 point (six of these), or 25 point (only two such), while S-Bombs take away 1 point, M-Bombs 2, and L-Bombs 3. Repeatedly bombing a wall will 'make the locals angry' and opening certain chests will begin a set battle with a random Vermin, unescapable and not avoidable with the Charm Bangle. There are also fake walls; attempting to destroy one starts a similarly unavoidable and unescapable battle with an Epitaph.

Once the player reaches the back of the cave, they will have to fight the King VERMIN!. After he is defeated, the party are automatically taken to the colony entrance and all the walls are reset. The player also receives the Font of Power Garment Grid.