Hi my friend
Below I suggest some names which in my opinion are really dark:
Compilations:
Orbis Tertius
Creeping Ambivalent Tedencies
Significant Elf Proclivity
Tales from Dark Forest
Orebro Freakfactory 2
Artists
Xenomorph
Dark Nebula
Azax Syndrome
KA-SOL
Kluster
Penta
Labirinth
I hope you enjoy those and...get scared!!!!