i really hate stinking cloud. it nearly killed my whole party, I'm UBER sure that it would be an easy task to kill all the undead w/o it.
A cleric with Greater Turning and a wizard/sorcerer combo with Haste and Fireball will clear out the 3rd battle quickly- if you do the game + NC up through Hickory Woods your casters should be 5th/6th level by then...:yes: