Envision Skepticism and Indesinence giving birth to a heinous sonic spawn. Sprinkle some Darkspace and Evoken on top, and the resulting abomination would surely resemble Gravkväde.
It may be trite to say, but this isn't an easy listen. It requires time and the gloomiest mood to get hooked on.
(Insert fitting signature here, as I can't come out with any right now).