I go to shadowmire edge, has trollo and munninns which are both offensive. Less HP = less attacsk to kill them. You can run from the occasional owlreed if you don't have a specialized moga to deal with them.
I fight the evil girl in Windhym Flowerpit over and over. Her monsters have low HP and no annoying stat moves like confuse, lose/gain a turn, or HP stealing.