So, I'm thinking of making a kinda dark and gloomy-ish folk song but I want some good, organic percussive bangs behind everything. Something like the ones on Agallochs 'Pantheist'. Anyone know any good Vsti's or a real instrument that could create such a sound (With extra tweaking ofcourse)

Timpanis, Bohrans perhaps. Folk percussion instruments. VST's: Well any orchestral VST with Timpanis would be okay. East West Quantum Leap Symphonic Orchestra is genius, albeit ******edly expensive. I personally would suggest a big Bohran. Tthe sound you are hearing in the Agalloch song is probably a Bohran as well.