I have 3 items of dragon armor. Are there more and what do I do with them? Are they used in a quest?

I need help in killing Josephina. She is so hard!!! I am level 37 mage and have 100+ strength and 100+ intelligence. I get killed by those darn spikes. <img src="/ubbthreads/images/graemlins/puppyeyes.gif" alt="" />