I heard in the forum that you can assemble a "set" for the demoness that reduces demon leadership by 100%. 50 dragons is nothing. How about 40,000 archdemons in a stack?:D
Just walking around, looking for more items...
Added 7 minutes later
Yeah, I also like to play without losses in the campaign, but it doesn't always work out.
I didn't really like the undead, but my favorite tactic for battles without losses was endlessly resurrecting paladin clones.
Right now, I'm trying to finish the Northern Warrior (haven't gotten around to Dark Side yet) - after the battle with Loki, it got boring; a leveled-up Viking can defeat everyone without any problems.