The current count is 9...
Confirmed relics:
1. Crescent Rivulet (northeastern part of the map)
2. Underworld crystalline weald.
3. Lucid Depths East entrance, second map (picture above)
4. Garamonde Village (far right side of the village, in between the trees and surrounded by treasure chests)
5. Wild Temple (top left part directly west from the main saving point at the middle)
6. Cleft of wind (map before fighting the wind fiend) all the way to the northwest part of the map.
7. Ancient Caves (map with all the jail rooms)
8. Trabia Base, post-world merge.
9. Elemental Abyss, right when the crystals in the walls turn red first map. You can't miss it.
Thank you all for helping with this.

