Thanks for your recommendations, I've listened now to both albums. What I understand is that the idea here is to create a kind of ritual, by that I mean it's not the conventional way of making and forming tracks. As a whole this music is meant for special and specific moments. I had thought the same when I had attended a black metal gig here and the first artist on stage (two bands to follow) was performing with an acoustic guitar the music, it was a way to build the atmosphere and fill the air and prepare the way for the other bands to appear next.
Pieces...To Heal A Soul In The Darkest Hour by The Dead Creed

I had also made a post about it, you can have a look if you want @hellene8/black-metal-gig-mgla