Uhm, the only Ad Noctum stuff I've heard is on a split cd with Haemoth, are they the same band? (there seems to be several Ad Noctum's around)
Mordulv, from what I remember (heard them quite a while ago, I haven't any of their material) are pretty damn aggressive, while Monomania combine raw BM with a more melodic guitar approach, if that makes any sense...
Got this yesterday at the ISIS/JESU gig:
Jesu - Jesu
Bloody excellent album!