In numbers wailing ladies are very good, their melee attack works similar like petrification.
A bit expensive though
In general its best to expand quickly where your dominion is to get undead freespawns fast, and go quickly for burden of time, well of misery and soul gate. Undead comanders: censors, bane lord, wraith consul and wraith lord.
Always have some bishops with you to reanimate the corpses after a battle to have soulless warriors.
Taxation set to 100%, until its in your dominion then you can set it too 200% and either patrol there or pillage it.
Building temples with cheap priests and castles with weak mound kings where your dominion is high for a bit better troops.(knights of the unholy sepulchre)