Seriously, if you have to ask how to get a tr00 kvlt black metal sound, you're doing it very, very wrong.
EDIT: And because I realised I'm just being an ass by saying that, and not really helping at all, here's some more pointers.
1) Experiment with all your microphones to find one that can get the meanest, most horribly fucked up sound possible. Find the one that appeals to you most, and stick with it. Better to use different mic's on different instruments so you can at least TRY and mix it a bit.
2) If you want to be a purist about your recording, don't go anywhere near dynamics controls. If you have to process anything for whatever reason, record it again. If the drummer isn't bashing the absolute life out of his drum kit with every hit, find a better drummmer.
3) Use natural reverb wherever possible. If you can record in a shit-huge room, you win. If not, try the old reverb chamber techniques - the cave suggestion wouldn't turn out that bad if you could get a setup to record that as your chamber. It'd definitely sound different, and that's what you want.
4) Guitars? It's up to you. Just keep that bass dial at zero. Remember that the majority of your 'tone' will come from the microphone in the end with this sort of recording, you're not aiming for clarity here.