I like the exponential aspect of the level scaling. The growth factor of 1,2 ensures, that leveling your creatures is wothwile even at higher levels, and with a likely maximum of ten levels the function doesn't grow out of control, as a level 10 creature would be about 6,2 times as powerful as a level one creature. I have yet to test the Necromancer and his ghouls in action, does anyone know a map, that has a steady supply of heroes?
A prison would allow me to process the heroes faster, so my ghoul supply would allow for all kinds of ghoul related shenanigans.
The crypt has a nice atmosphere to it. you can't shake the feeling, that the realm of the dead is only one bus stop away, figuratively speaking.
The things I enjoy the most is, that you can pick up gold, I can hold all the money in my hand!
Edit: After some testing, the Necromancer seems to be working. I have observed teams consisting of on Necromancer and three Ghouls, and they can reliably defeat those pesky dwarves. The Juggernaut seems to smite the ghouls easily, though. The Ghouls had level 1. Will they adjust their level to the level of their Necromancer?