I had been thinking to suggest dinosaurs (or something modeled after them) but wasn't sure how it would be received. Anklyosaurs, Triceratops, Allosaurs in mid game, and Tyrannosaurs for the late game, could be really fun.
To make up for their lack of magic, they could have high prot (very thick skin), multiple strong attacks, and the spell could describe that due to their nature, when they are summoned they are also enslaved, making them mindless with a 50 morale. Or perhaps the mid game dinos would just be "unruly", so they'd be trained like the predator lizards, and just be 15 morale or so, but big Rex hs to be Slave Collared.
Does Slave Collar counteract insanity? Some of the more fantastic creatures could be summoned with high insanity or Shattered Soul if so, and you'd have to collar them immediately to retain control.
