I am in the cave at level 10, and it's not hard to figure out how to do it. My tank just happened to spawn by the NPC dwarf. Once the big bug spawned, I climbed the ladder back up and slowly took out the bug. It was then a matter of getting the tank to the ranger who was in the first turn of the battle with another big bug. Once the two of them killed it, then it was just a matter of mopping up the rooms, and working my way to the summoner/thief locked in battle with the two possessed dwarves. I haven killed them yet, but it should be no breeze with the three of them. After that it's on to the egg chamber to get my wizard out. I suppose I could teleport him away, but what's the fun in that. When I cam across a door I couldn't unlock, I could beat it open. Haven't needed the tunnels yet. I think it's a really fun part of the game so far, making it more survival horror than RPG.
