Chapter 3-5: Darkness Named
Area Map:
Pso'Xja
First, head to the Infirmary in Upper Jeuno and talk to Monberaux. Next, head to Neptune Spire in Lower Jeuno and go into Tenshiodo and talk to Ghebi Damomohe (I-7). She'll ask you to bring one of the 3 chips that can be obtained from Pso'Xja.
(Rare/Ex) Carmine Chip
Snow Lizard or Frost Lizard
(Rare/Ex) Gray Chip
Diremite Stalkers (at Tower near Ranguemont), Diremite Assaulters, Diremite
(Rare/Ex) Cyan Chip
Treasure Chest Mimics
Bring either one of the above chips back to Ghebi Damomohe to get a key item and a 500 gil reward. Next, go to Beaucidine and enter Pso'Xja via (H-8) tower (near outpost guards) which has a Lv.40 cap. Gazers and Snowballs will aggro at this level.
Directions

Check the Memento Circle to enter the fight. In here you'll fight Diabolos. He is fairly easy to battle if your tankers have blink. He has a AoE Sleep attack that even drinking Posion is hard to counter so have your WHM cast Barsleepra. Once its HP reaches a certain level, Diabolos will start to remove the flooring tiles away in thearena. If you are standing on the tile that is removed you will drop down to the basement below where a swarm of Diremites waiting.

Layout of the Arena
OOBOO
OOOOO
OOOOO
OOOOO
OOOOO
B is initial position of Diabolos.
There are 3 patterns that Diabolos will remove the flooring
| First | Second | Third | Total |
OOOXX OXOOO OXOXO OOOXO XXOOO | OXOXO OOOOO OOXOO XOXOX XOOOX | XOOOX OOXOO XOOOX OOXOO XOOOX | XXOXX OXXOO XXXXX XOXXX XXOOX |
Where X is the removed tile.
Diabolos also has a Weapon Skill that causes knock-back effect, which, if you are standing on an isolated tile, will cause you to fall down. Find a wall at the arena sides to face your back to.
Recommended fighting positions for melee (*) and mages (#)
XX#XX
OXXOO
XXXXX
XOXXX
XX**X
Defeating Diabolos will earn you a title. Return to Upper Jeuno to talk to Monberaux doctor at the Infirmary to finish this chapter and earn another title.

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