My take:
Cerberus
HellHound
Ravager
Deathbringer
Doombringer
Plague
Annihilator
Executioner

On the topic of Exorcist, back to the Bible, when Jesus asked a man possessed by demons, he asked for their name. The answer was "My name is Legion, for We are Many."

And so: Legion.

Okay here is one more, the opposite to the Exorcist:

Demon

One bad idea after another. I have never seen a game deteriorate so quickly.

The new upgrade times are so screwed up. Implement this, I will consider playing another game instead, which I already started.