I asked this question in another thread, but it was kinda off topic and got lost... but:

Does anyone have experience with AOE (arcane explosion + holy nova) in instances with 4 mages/1 priest? I know that there was a guy on here that did a speed run of Bot with 4-5 Holy priests spamming Holy Nova... I was wondering if anyone else had experience. It would be a generally good idea to burn down the hardest hitting mob by focus firing it before they got to you, but after that, AOE!