As part of the Keeper's Questline, you are supposed to find 10 different Sky Crystals across various locations on Fisch Island. While a few are easy to locate, others require an intensive search. So, if you have found a few Sky Crystals and are looking for the rest, here is a detailed guide.
Where are the 10 Sky Crystals located in Fisch?
Below, you can find all 10 Sky Crystal locations in Fisch & the fastest way to reach each of them.
Note: The list is not complete, and we are trying to find more Crystal Locations as we explore other islands. If you wish to contribute, please share your answer in the comment section.
Sky Crystal Location 1 - Lighthouse Sky Crystal

The first one is located on Moosewood Island. After reaching the island, go towards the back side to find the lighthouse. Enter and climb the stairs to reach the top, where you can find the Sky Crystal at GPS (686, 252, 318) underneath a glass window panel.
What is the use of Sky Crystals in Fisch?
As mentioned earlier, Sky Crystals are part of the Keeper Questline. You must collect each of them to restore the Abaia's Chamber, unlock the initial gate & wait for the awakening.
For more on Fisch, check out How to Wish for Limited Rods on Skycrest Island- Fisch or All 29 Fish in the Skycrest (100% Bestiary) – Fisch
Read more: All 10 Sky Crystal Locations in Fisch – The Keeper’s Questline