A new type of Great Person that emerges through combat experience rather than birth rate. They can be used to lead an army for a massive experience boost, build a Military Academy for faster unit production, or join a city as a Military Instructor.
A new diplomatic mechanic where players can subjugate other civilizations or offer themselves as a vassal. Vassals provide tribute and support their masters in war but may secede if they regain enough power. Sid Meier's Civilization IV: Warlords
Released in July 2006, is the first expansion pack for Civilization IV , primarily focused on enhancing the military and diplomatic aspects of the game. Key Gameplay Features A new type of Great Person that emerges
The Carthaginians, Celts, Koreans, Ottomans, Vikings, and Zulu. Vassals provide tribute and support their masters in
To further distinguish civilizations, every civ received a Unique Building that replaces a standard one (e.g., the Zulu "Ikhanda" replaces the Barracks), providing specialized bonuses. New Civilizations and Leaders:
The expansion includes that offer gameplay different from the standard 4000 BC start, such as the Rise of Rome , Chinese Unification , and Genghis Khan . It also introduces three new wonders , including the Great Wall, which uniquely shows up on the world map. Civilization IV: Warlords Review - IGN
Three new leader traits— Charismatic (+1 happiness, faster promotions), Imperialistic (faster Great General generation, faster Settlers), and Protective (free promotions for archery/gunpowder units). Scenarios and Wonders