I did this story quest on my Ele and it was a tough one. It required me to keep moving dodging all the enemies who would CC you. As a necro I would think that your minions would be a huge help. I also found on some quests that it was best to gain a few levels and then come back and knock them out. At level 26 you are only a few levels away from unlocking elite skills which could be a big help. Having someone do the quest with you also wouldn't hurt.