[No Spoilers] What instrument is used as the main tune in "Warrior of light"?

Hi!
Since it's my favorite track of my show I wonder what instrument is used to create the haunting tune.

And whether it's the same instrument that's also used in the later "Keel for No Man" and "The Red Woman" variants

Submitted September 25, 2021 at 10:33AM by mzso https://ift.tt/3ERivQ0