[llamabeast]

You could just make a map with zero populations and magic sites, make a few mod nations with no recruitables, and you'd be good to go. Use the summons etc from vanilla Dominions, I think they would work fine.

You would have to think what to do about research. You could have each nation start with some awesome researcher in place of a scout (research 40 or something), and then that researcher alone would allow you to gradually access more summons.