First i wanna say check out effedupmovies.com to stream some of the hardest to find horror/extreme horror films around. Also they host just other great, depressing movies as well. Lot of gore flicks and pornogore fetish type shit if youre into that also, and just plain old obscure shit. Its my fave streaming site.
Heres a list of 10 films tho (not necessarily found on that site, tho a couple can be). Not in any particular order.
1. Mandy
2. Bone Tomahawk - check out the other 2 movies by S. Craig Zahler while youre at it. (Brawl in cell block 99, Dragged across concrete) great style with this guy.
3. The House That Jack Built - can be found on effedupmovies.com. lars von trier, great movie, dark as shit. We all know this director.
4. Censor - i fuckin love this movie, what can i say. Its on hulu pretty sure.
5. Color Out of Space - based on the lovecraft story, one of the best lovecraft/cosmic horror films ever made imo. Def the best lovecraft adaptation imo. The monster is fucking incredible in this. And nicholas cage is great in it, made me laugh even a few times.
6. The Blackcoats Daughter - much more slow burn of a film, heavy on atmosphere. And plus kiernan shipkas cute ass is in it. I like it alot.
7. The Void - cosmic horror film, tied up there with #5 COoS, although it is not a direct adaptation, which might make it even better if youre a stickler for lovecraft. Great monster design, great ending, great practical and visual effects imo. Just a really good movie that not many people have seen.
8. The Wailing - i forgot what else this guy has directed, but this movie is incredible. Longer movie, with alot going on that you will miss the first time, so watch an explanation on youtube afterward to glean even more and be even more impressed by it. Even so, this movie is great and full of depth on first watch.
9. Pyewacket - another underrated and not very well known film, one of my personal faves. One of the better seance type movies. Watch an explanation for this one too to make sure you caught what actually happens, its pretty intricate in plot, but you can just watch it for the ghost/horror aspect and still really enjoy it imo. The other movie by this director is also great but more thriller, called backcountry. Man vs nature movie that one is.
10. Saint Maud - i guess i saved the best for laat accidentally lol. This one is prolly my personal favorite from the list, mostly bc the religious/mental illnes theme. I fuckin love this movie so goddamn much. One of the best endings ever, and Maud is such a damn good character.
Hope there was at least one movie that is new to everybody. Not exactly the
most obscure films ever, but thats why i plugged effedupmovies as well lol. Youll have to do your own browsing on there tho, theres so many fuckin movies on that site im tellin you.