Undead Warrior no losses?

[Kathos]

Don't get me started on those skel archers, that black arrow is strong! They were always my first choice in any fight to kill or at least dwindle down before worrying about the less threatening vampires/ghosts.
But yea thats one of the main reasons I could never find the motivationg to go through with an undead hero. The bigger skills were so deep in the talent tree, and it took a while to get into the cemetery to really get some of the units. At best all there really was to recruit was some zombies skeletons and ghosts. I found Vampires and Necromancers to be quite a rare find. And I always thought it would be cheating a little to pick up inquisitors just becaus of tolerance =p
If anybody has some advice on starting an undead hard/impossible of any class (preferably paladin, always been my fav of the 3) it would be much appreciated, seems like it could be an even bigger challenge than the normal no-loss with whatever units you can scrape up.