This should be the last optional stop for you right now before we get back to the main quest. This dungeon is very rewarding because it contains a powerful summon for Rydia.
I would say this is a requirement to have Rosa to be at least level 40 (learned Reflect). You can enter the cave and farm in 1F or 2F of the cave though. You'll know why this is very important later.
Item checklist:
- Ether
- Phoenix Down (x2)
- Hi-Potion (x3)
- Cottage
- Poison Axe
- Kiku-ichimonji
- Bestiary
- Defender
I wanna state it again before you proceed to #3, make sure that Rosa has at least level 40.
The Feymarch
*** Note: Rat Tail is important, you need it to exchange for Adamantite.
When you reach #3 talk to the Eidolon for a side quest. He basically ask you to locate all of his friends across the world and the reward is Piercing Magic augment.
Go to #4 and fight the two powerful summons, Asura and Leviathan.
Boss: Asura
Strategy: the key to victory is having Rosa uses dualcast Dispel and Reflect on the Asura so that she won't be able to heal.
Boss: Leviathan
Strategy: there is not much to do here, but Leviathan is weak against Lightning, so Rydia summoning Ramuh should deal a huge amount of damage.
Once you get them both, backtrack to #1 to exit.
Item checklist:
- Ether
- Bestiary
- Rat Tail
- 5000 gil
- 6000 gil
- Yoichi Bow
- Dry Ether
- Yoichi Arrow
- Elixir
- Bestiary
- Phoenix Down