In addition to the improvements brought about by the new expansion, Wrath of the Lich King, a specific feature was also introduced in order to help keep the game fresh and interesting for new and older playes alike. This feature, the Achievement system, was brought in to offer additional challenges, cater to the more "goal-oriented" players and share your accomplishments with other players. Some of these achievements grant titles, such as the Explorer title, some grant special mounts or pets and some are designed to test the limits of a player's endurance for either PvP or questing.