How amazing would an ancient Greece mod be for this game? Instead of thralls you have helots. All that sweet as Greek armour and shield/spear combo. Whitewash walls and pillars to make your own friggin Acropolis on a mesa and replace Conan lore/religion/avatars with Greek mythology. Combine with the tribes near you to make your own damn city-state. Hell even "enslave/absorb/subdue" surrounding player tribes to raise your hegemony. Make your warrior NPC's fight in phalanx.
I'm sweating just typing these ideas out, just a Corinthian helmet alone would make me smash my face on my keyboard.