Civ IV: Warlords

Warlords is the first expansion pack to Civilization IV. It featured:

-New great person: Great Generals

-Institute Vassal States

-8 New Scenarios

-6 New Civilizations

-10 New leaders

-3 New leader traits

-Unique buildings for each civilization

-Three new wonders

-New units, resources and improvements

-Core Gameplay tweaks and additions

Civ IV: Beyond the Sword 

Beyond the Sword is the second expansion pack to Civilization IV. It is based after the invention of gunpowder and includes 11 new scenarios, 10 new civilizations and 16 new leaders.

Other new features included are:

Corporation, which is a new gameplay feature, similar to religion which allows the player to create corporations and spread it across the world.

Espionage is now available earlier in the game which expands into new ways for the user to spy on other nations, stir citizens unrest and defend their governments secrete.

Random events, a new features where events including natural disasters, pleas for help or demands from their citizens. 

Advanced Starts is a feature where the user cand purchase components for an already developed nation.

Expanded Victory's, the Space and diplomatic victory's have been expanded further.