Actually with the quest "Guild without masters" i finished after i was able to change into a dragon.

You can fly there, to that building it is high enough where the poison gas doesn't hurt you.
So then u can go in and complete the quest without having to get exp from anywhere you can find it, in order to take on those ring members in the quarry building.

i7 Extreme 965 bloomfield 3.20GHz
Asus rampage Ii Extreme
12Gb of Corsair ram CM3X2G1600C8D
nvidia Geforce GTX 285 (soon to be upgraded)
win 7 64 bit