There will be a few Lightroots necessary to make your search easier, but like the mines, the majority of them will be close to the chasm you five from the surface.
While the Depths can be a daunting task to explore, luckily the pieces of his armor set are all found relatively near their closest Chasm entry points. The location of where these pieces are hidden vary, even if they are from the same armor set. However, even if you have not found the Old Maps, you can still head out to acquire the hidden armor pieces. Old Maps hidden in treasures throughout the Sky Archipelagos, usually mark you the spot for the location of armor pieces. Where to Find the Armor of the Sky Set in TotK
The Armor of the Sky Set is comprised of three armor pieces:
