Well, the killer archers can be a big enough difficulty without any help. The towers and the other side of the lower levels can be annoying. Summons and AoE spells are useful. This is a good place to use Confusion and Emotion: Hopelessness.
Camping for XP is not only a good way to gain big XP for little risk, it's also a good way to figure out the best way to use certain spells. It's a great way to experiment with tactics to get the most out of Agannazar's Scorcher, and also to learn the proper range and timing for a Fireball. Do it, by all means. I've never been able to pass that area by without camping to at least get the next level for a key spellcaster or two.
