Brenoritvrezorkre and M. Ostermeier came to mind first. Brenoritvrezorkre is good in certain occasions, but I enjoy M. Ostermeier in almost any situation. His music is very thoughtful and introverted. I love it. There's only 2 songs of his on YouTube, one of which is from my favorite release of his!
Dark minimalistic ambient. Amazing stuff. I review quite a bit of stuff that isn't very popular. I wouldn't say obscure so much, but almost.