Dungeon synth is atmospheric music done primarily with keyboards and synthesizers. The themes are usually based around fantasy, paganism, and ancient, medieval times. There is often a noticeably lo-fi quality to the sound.
The musicians often have a strong connection to black metal, many dungeon synth bands being side-projects of artists whose main focus is black metal. The most recognizable and influential artists in the genre are Mortiis, Lord Wind, Wongraven, and Burzum (with the albums "Dauði Baldrs" and "Hliðskjálf").
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