Mythic Ages Megafauna Bestiary and Alpha animals for obvious reasons. Maybe add the Jotun Ogres and Crazed Titans from the Big and Small mod? At least the latter is a real monster. A madman broken by Archtech who crushes everything and everyone, yet has a huge increase in strength and armor.

This is a pretty interesting mod. Could you make it available for the regular Roman version as well? A space marine will hunt various monsters and creatures with an energy rifle. I think that would be interesting too. Monsters will be monsters at any time, they'll just be different threats.