ArenaNet stated that this was because they felt that this format was restricting their ability to add new game mechanics and balance the overwhelming number of skills introduced with each title, and decided to begin work on Guild Wars 2 to address these issues (with Eye of the North bridging the gap between Guild Wars and Guild Wars 2). Guild Wars: Factions 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. Guild Wars: Nightfall Guild Wars Nightfall, the third chapter in the Guild Wars saga, was released on October 27, 2006. As with the previous chapters, this is a stand-alone product, but it can be merged with the previous campaigns to enhance the gaming experience. This third chapter introduces a new world map, two new professions (the Dervish and Paragon), a new PvP mode, but its most remarkable new feature is the introduction of "Heroes" who travel with the character between missions and campaigns and are fully customizable by the player. Guild Wars: Eye of the North Eye of the North is the first true expansion pack in the Guild Wars series. Released on August 31, 2007, it requires one of three earlier full campaigns, and introduces two new races—the Asura and the Norn—that will be playable in the upcoming Guild Wars 2. It is intended to bridge the gap to Guild Wars 2 by means of a Hall of Monuments, a mechanism that allows transferring achievements in the original series to the sequel. Guild Wars: Beyond In an effort to resolve plot threads, ArenaNet has released a series of "mini-expansion" updates, collectively known as Guild Wars Beyond. This series of storylines and events in Guild Wars helps set the stage for Guild Wars 2, which takes place 250 years in the future. Guild Wars Beyond begins