Auto-translated
I agree about the devils... plus the ice creatures... The greens are among the slowest shooters (only ballistas and wasps are slower), going anywhere with them is torture... and Cerberuses - people won't attack you with magic, but with their hands and feet... so... ghosts are more useful.
Ghosts, in addition to vampires, are good when you put a Martyr enchantment on the ghosts so that the damage goes to the vampire. Then the ghosts deal with the undead and age the living. And the vampires feed for both.
A vampire is useless against life.