Every expansion has removed or replaced old content and introduced controversial or unwanted mechanics, resulting in many players expressing a preference for older versions of the game. For example, the game's first expansion, The Burning Crusade, removed the original level-60 version of Kazzak, and in the process, all of the items that he dropped became forever unobtainable. Burning Crusade also added flying mounts, which were criticized for their effect on world PvP; raised the level cap to 70, which was criticized for making all level 60 content obsolete; and opened the formerly faction-specific Paladin and Shaman classes to both factions. The second expansion, Wrath of the Lich King, removed the original versions of the Naxxramas and Onyxia raids and all items that could be obtained from them; added a Random Dungeon Finder tool, which many players felt spoiled the "social aspect" of the game; and made certain UI improvements that were criticized for reducing the need to read quest descriptions. Blizzard repeatedly refused to create legacy servers so that players could stay on older versions of the game. One of their oldest refusals was posted on February 21, 2008, by Drysc, who stated "We were at one time internally discussing the possibility fairly seriously, but the long term interest in continued play on them couldn't justify the extremely large amount of development and support resources it would take to implement and maintain them. We'd effectively be developing and supporting two different games." Versions of World of Warcraft that existed prior to the launch of The Burning Crusade were often referred to as "vanilla" by players, but were referred to by Blizzard as "classic" at least as far back as November 29, 2009, when Vaneras wrote "We occasionally see requests for us to open pre-TBC realms, or classic realms if you prefer. Lately there have also been requests for pre-WotLK realms, and I am sure that once the next expansion pack is released there will be requests for pre-Cataclysm realms as well. We have answered these requests quite a few times now saying that we have no plans to open such realms, and this is still the case today. We have no plans to open classic realms or limited expansion content realms". Demand for Classic and other legacy realms significantly increased when the Cataclysm expansion revamped the entire original game world, making the majority of the classic or "old world" content