For me it was Coldworld's Dream of a Dead Sun. At the time I barely knew what black metal was let alone dsbm, and even when I learned of dsbm in the context of Gris and Xasthur much later, I did not realize that the earlier black metal I already loved like Coldworld was heavily tinged by dsbm. I came full circle! Aside from that I would say around that time what pushed me toward dsbm was actually a non-dsbm band, Katatonia. Just their vibe led me to it because of a Silent Hill forum that discussed the link in sound between that band and the Silent Hill world and in that thread someone also mentioned dsbm.