[Sombre]

Problems with morale can be offset a great deal by using Plague Priests to spam sermons along with their summoning of undead. I've also found mixing spawn created with the Pitbreeding spell into units does wonders to bring up their average morale (many spawn have mor 16) and of course if you can get plague monks to berserk they do very nicely as well.

In a recent test game I tried going for a Skryre heavy army (I had gone pestilens/moulder in the previous one) and it was very fun mangling stuff up using great hordes of slaves and brown clanrats backed up by warpfire throwers and spells.