"Guild Wars Factions" is the first sequel to "Guild Wars", and among other things adds a new world map with accompanying missions, two new professions (the Assassin and Ritualist), several new gaming modes, and "titles" which measures the advance of characters in several tasks. It is sometimes referred to as the second "chapter", with the first one being the released game itself, but then with the label "Guild Wars: Prophecies" to make a distinction between the chapters. Be aware that this is not an expansion pack, but a stand-alone product, meaning that it does not require "Guild Wars: Prophecies" to play, although it enhances the player's gaming experience to have both titles.