I love it when the name of a musical genre gives you an instantaneous understanding of what it is. (See "Mallwave.") Until today, I hadn't heard of the Dungeon Synth microgenre but instantly had a visceral understanding of it. From The B-Side:
A microgenre found at the mysterious intersection of old-school electronic music, synthesizer-based movie and video game soundtracks, and second-wave black metal, dungeon synth is quite a strange place to be. Melancholy, lo-fidelity, synthesizer albums recorded by artists like Mortiis, Depressive Silence, and Lamentation in the 1990s set the template for the genre, but never really circulated that far out of the black metal underground world. More recently, dungeon synth has made quite the comeback on platforms like Bandcamp, lurking in the weirder corners of the digital realm, and you should be listening.
"On Dangerous Paths: An Introduction to Dungeon Synth" (The B-Side via Metafilter)