phase 3 bosses soon

Ok one thing I've never got: so the the stonefang tunnel is like supposed to be beatable as the second area right? The armored bugs though they take so long to kill even despite being able to kill everything around them normally. Was there supposed to be some trick to killing them that I just never got? They're not even that tough of enemies I don't know whats going on like where they just supposed to be timewasters or something? I at least eventually figured out that Dark intended you to go to the catacombs with blunt weapons, and preferably divine but I have no fucking idea what they were intending with the bugs.