Throughout the game, there are a total of 4 Moonstones to obtain. This item is therefore very limited in availability. A Moonstone can be useful for several different functions:
- In battle, it can be used as a healing item (= NOT RECOMMENDED).
- As equipment, it grants the ability Beast Killer (= more damage against "Beast" enemies), and in the case of Dagger or Eiko, it also teaches Shell (= a spell that reduces magic damage taken by a chosen character).
- Eiko's summon Carbuncle gets a stronger attack if she is also equipped with a Moonstone.
Here are the 4 locations:
1. At the beginning of the game, there is a minigame with Zidane in a sword fight. After the minigame, you will receive a score from the audience ranging from 0 to 100. To obtain the Moonstone, you need to achieve the maximum score of 100 (if you fail, the game gives you the option to try again). If successful: when you gain control of Steiner, you must speak to Queen Brahne. She will give you the Moonstone.
2. In Conde Petie, there is a puzzle where you need to find 4 coloured stones to place into a statue. You will receive a Moonstone for this. I’ve included a video for the locations of the 4 stones.
3. During the Friendly Monsters Sidequest, one monster will give you a Moonstone. This is because another monster in the same quest wants this item.
4. After the events in Terra, Stiltskin can be found in the church tower in Alexandria. As always, he offers a collection of items. This time, there will also be a Moonstone included.
An important note is that the first 2 mentioned Moonstones are missable! The first one is only available at that point in the game. For the second one, you essentially have until just before you travel to Terra, but I recommend doing this during your first visit to Conde Petie.