For you, and the entire Barbarian Horde, I suggest the soundtrack to "Warhammer 40,000 Darktide". This gothic/industrial mix is perfect for Vampire, Ravenloft, WtRoF, and of course 40k. Check out "Immortal Imperium" for a theme song for a temple of Oliss and "Disposal Unit (Imperium Mix)" for battle music when The Enforcers get that ass.
Nice ideas, it's hard to go wrong with classic rock. Been doing some 80's-esque darksynth and Phonk for a Sci-fi setting. Music/soundscapes are a must IMO.
Depending on the game and setting, I've used some heavy metal, bands that do movie and movie trailers score like Arcana, Sephiroth and Two Steps From Hell. Also the music from The Elder Scrolls game and Dark souls. For some fantasy ambiance and background music I like Bardify the RU-vid channel