Let's go back to the Lunar Whale to start our final dungeon on the Moon.
Just like Sylvan Cave, Lunar Subterrane has 2 separate paths. The first one leads to a dead end with several treasures.
Siren (Optional)
You need Siren to farm Pink Tail. You can skip this if you don't plan on completing the achievements.
When using Siren, you'll automatically trigger a battle with a rare encounter at your current location. This is very helpful for grinding rare items.
So let's go to Hummingway Home to buy 99 Sirens. One of the Hummingway sells items (the one on the right side), so you have to find him.

Crystal Palace
Lunar Subterrane is only accessible via a portal inside the Crystal Palace.

Lunar Subterrane - Side Path
You'll get 3 items via this path, so put them on your party members immediately when you get them:
- Black Garb - put on Edge.
- Sage's Staff - equip on Rosa.
- Murasame - ultimate weapon for Edge.
Before interacting with the Katana on B3, have Rosa use Float on everyone.
Bestiary Checklist:
Boss: White Dragon
This boss doesn't have any weaknesses and it has strong physical attacks. It has a few notable tricks below:
- It counters Slow when it gets hit by a physical attack.
- It counters Earthquake when it gets hit by a summon.
- Its signature attack is Maelstrom, which lowers your entire party's HP to a single digit.
Strategy:
- Rosa should have cast Float before triggering the battle. If not, you can cast it at the beginning. Float will cause Earthquake to miss when Rydia uses a summon.
- Rosa casts Protect on everyone to reduce physical damage. Don't bother using Haste since you will always get Slow when you attack.
- Rydia summons Bahamut, and everyone else attacks.
- If you get hit by Maelstrom, immediately heal using Curaja.

Chests/Items:
- C-311: Black Garb (Monster) - B1, bottom-left corner via a hidden path.
Monster: Giant Warrior (x2) - C-312: Sage's Staff (Monster) - B2, 1st chest after the entrance.
Monster: Selene Guardian (x2), Dark Sage (x2) - C-313: Murasame (Monster) - B2, 1st chest after the entrance.
Boss: White Dragon
Use Teleport to exit the cave, save your game, and re-enter.