Within "EverQuest II", each player creates a character to interact in the 3D, fictional world of Norrath. The character can adventure (complete quests, explore the world, kill monsters and gain treasures and experience) and socialize with other players. The game also has a 'tradeskill' system that allows players to create items for in-game use. The player chooses their character's race and type, which affects their abilities. Characters collect experience to advance in level. "EverQuest II" enables social interaction with other players through grouping and the creation of guilds. Like players, guilds can gain experience and levels, partially from players completing special tasks called Heritage quests, but primarily from guild-oriented quests and tasks called "writs," and gaining guild experience by killing epic monsters. Higher guild levels open up special rewards unavailable to non-guilded characters, and cause certain other rewards to cost less. These rewards include housing options, mounts, house items, apparel, and special titles. Although "EverQuest II" focuses on player versus environment (PvE), dedicated player versus player (PvP) servers were added in February 2006. "EverQuest II" has a heavy focus on quests—more than 6,000 exist. The "EverQuest II" feature set has expanded since its release in 2004.