[PvK]

1) Wailing Ladies' best trick is their Fear effect. For that, they are perhaps worth their cost. You don't want them to try to engage in combat - you want them hanging out just behind the front lines to break the enemies' morale.

3) Tartarians are one of the best summons in the game, especially considering their cost. There are lots of other very good death summons, too.

4) Be sure to try to have priest support available for Power and Protection of the Unholy Sepulchre, etc. Raise Skeletons is good to spam.

5) Build forts so you get better freespawns. Freespawn mound kings are great for troop-zooming if you have enough. If you group the faster undead by type under fast leaders, then they can move er, faster.