Dominionization! Lead your band of cavemen to develop their own unique culture, discover a being of great power to worship, and commit unfettered genocide among the people whom you fear because you can't understand!
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The Sims 3: Dominions -- Play a family of peasants in a fantasy-medieval setting. Gain education, happiness, and other benefits for your Sims. Suffer when your daughter gets carried off by a blood hunter. Then someone wishes for Armageddon, and you all die.