While it does seem that the Giant Scarab (level-191) is weak to magical attacks, multi-way spells (like Ice Burst from Ancient Magicks spellbook) didn't seem to hit multiple enemies (the Scarab Mage was standing beside Giant Scarab). Also, I would advise killing the Scarab Mage when it appears then focusing back on the Giant Scarab, because he hits hard with magic if you're not protecting from it.

 

 

 

Cowman EDIT:

 

Under Tips, Tricks & Notes, the Genie lamps can give you xp in Summoning.

 

If you use the safe spot, there's no need to fight either henchman.

I vote with Sports Guy.

 

 

 

However, I'm pretty sure that I simply used melee to beat the stuffing out of the big guy right up front, and ignored the henchmen.

 

 

 

This is the kind of thing that is hard to adjust a long time after the quest is released. Usually what goes into the guide is based upon the experiences of dozens of users who post when the quest first comes out.