I would love to see a progressive threat that gets some smarts to expand their territory that will eventually encroach on your own territory forcing you to find the root cause and eliminate it. Maybe give a warning message each time one starts to coordinate and expand. like "The trolls to the east are amassing an army and conquering nearby territory". Something to add a persistent threat to your base that forces you to seek out where the threat is coming from. I also would like to see some friendly npcs as well