It was my first time in .. and I went in as healer (which on the whole wasn't a bad thing) and I couldn't get properly out of that middle circle. I'll need to experiment with npcs whether I can survive being close to the middle with a crit shield...
but yeah we had one wipe there and one wipe on the last boss (I didn't read the worm tells right on the first try), and died once more to the second boss but the gnb and drg managed to kill it the second time