The Omen scenario is for Civilization IV: Warlords.
In this scenario you can play as the British or French. The Native Americans are also in this scenario. The goal of this scenario is to spread your religion until you get to get at least 72%. There are also new units like militia and a new type of horsemen. The scenario takes place in the Ohio valley. The religions are Roman Catholicism and Protestantism. There is a powerful horseman unit in the game which has 999 units of attack. The leaders are George Washingtion and Marquis Duquesne. There are the five different divine powers.