If you are after the Soul Reaper Rod quest, you must do multiple tasks, including giving all the collected parts to the three Ghosts living in separate locations. Since the clues regarding these locations are pretty vague, players struggle to locate them. So, if you are one of them and want to know the locations of all the ghosts, here is a detailed guide.
Where are the three Ghost locations in Fisch?
Below, you can find all three Ghost locations in Fisch, along with the quickest way to reach them.
Ghost Location 1
The first Ghost is at the topmost point of Roslit Volcano. Make your way to the Roslit Bay using the tag marker on the screen. After reaching the area, enter the Roslit Volcano opening and make your way slowly to the top from inside and outside until you reach the GPS location (-2001,190, 389). This is a ledge where you can locate the Ghost at the end.
Ghost Location 2

For the second one, travel straight to the Statue of Soverignty using the maker on the screen. Take the elevator and reach the Enchantment Altar. Here, go towards the left side of the Altar to find a small secluded space near the sea at GPS (1419, -837, -144). Open your glider and fly straight to the location to find a Ghost.
Ghost Location 3

The final 3rd Ghost is located behind a small house in the Living Garden. After teleporting to the POI, go to GPS (-2564, -309, -3114). Here, look towards the corner area at the back of the house to find it.
For more on Fisch, check out How to get all 11 Pearls for the Igneous Altar in Fisch or All 6 Fishes in Octophant Pool (100% Bestiary) – Fisch