So i make the start here.
I am lvl 24 and on Montero at the moment. Choosed to play a warrior. The beginning was a little bit hard because there were so few good undead units on the first islands. I got a few vampires and ancient vampires. Made trolls out of orcs and used sacrifice a LOT to make bigger stacks out of them.
They rule. I use them in bat form and they are nearly undestroyable when there are living units on the field. Undead armys as enemy are painful as expected. I have evlin now, so its ok, but no fun. Ive found the vampire blade, but im looking forward with terror for the supression fight. Undeads and gremlin towers.
No unit lost till now.