You get two new factions, the Carthaginians and the Iberians, more unit upgrades, and a few gameplay enhancements.

Nemesis of the Roman Empire is more of a mini-sequel than it is a full-blown second installment to the critically acclaimed Celtic Kings. Multiplayer games support up to eight competitors, across the Internet or a local network, and feature a scenario editor and random map generation. The Teutons return also, in both single- and multiplayer sessions, as a neutral faction prone to attacking any who cross its borders. In multiplayer skirmishes, players can choose to command the forces of one of four ancient nations - the Romans, Carthaginians, Gauls, or Iberians - each offering different inherent strengths and weakness. Commanding the Romans through their campaign, players work to expand and develop the republic throughout the Punic wars, leading their forces through the invasion of Sicily, the conquest of Hispaniola, and the razing of Carthage. Following the history of Hannibal Barca, players can lead the Carthaginians through the Sagunto battle, the famous crossing of the Alps, and the Cannas battle. The game offers two story-lined campaigns, allowing players to win the world from either throne. Beginning immediately after the ending of conflicts of the first game, Nemesis of the Roman Empire focuses on the struggle for ultimate world power between the Romans and the Carthaginians. This historical strategy game is a sequel to Haemimont's Celtic Kings: Rage of War.

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