Here’s my idea.

Simple RTS. You play as a barbarian clan. Take over villages to gain your numbers, to take over the city.

Random world gen. You have to get resources by killing the villagers. You can’t get resources yourself.

When taking over a village, you can rape it, for more units, pillage it for more gold, or slaughter it for more meat.

It’s kinda dark. But isn’t that the point?