Paradox has released Sword of Islam, the first expansion for Crusader Kings II, on PC and Mac. The expansion allows the player to command Muslim nations, which provides more “polygamous problems, new laws, traits, titles and over 100 new events, as well as a flavorful Islam-inspired interface,” as any Muslim ruler across the Ottoman and Mamluk empires. A free update as well as additional downloadable content is also available which introduces improved combat mechanics, numerous new events, traits and decisions to the main game. The expansion will run you $9.99/€9.99/$9.99. Screens and the launch trailer are below.