Act 4 is predominantly Raanaar and a few imps.
There are quests which effect your reputation, though unlike in DD this does not have any effect.
I fought some Bloodknights in the after game BF, and didn't have nearly as much trouble as I did at the start of act 3. <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
There are 2 more mages around, that also drop spell books when defeated.
You can do a few quests for the good guys, as well. If you think about it, that is also evil. <img src="/ubbthreads/images/graemlins/evilgrin1.gif" alt="" />
