Originally Posted by Grizlor

Another option if supplicants are camped would be the ruins of baa'ri in SMV. Even the shaman mobs there pretty much only bloodlust + lightning shield + melee, so no true casters to my knowledge. Mob density is very high, and respawns are pretty quick.

You could also give the ethereum staging grounds in netherstorm a shot. Most of the 'casters' there just run up and do weird electro shock stuff, and melee.