I found vampires and tested them a bit. I wasn't very impressed. They only regain lives when in bat form. And if I understood it right they only resurrect ones that died in battle while ghosts go above what they had in start.
At the moment my army is cursed ghosts, inquisitors, shamans, evil beholders and griffins. In pirate island in most fights I build up my cursed ghost stack and sacrifice it every few battles to build up other stacks.
I really love cursed ghosts. They are first melee which can fight against melee stack or even two for several rounds and my stack just grows.
