World of Warcraft: Wrath of the Lich King often referred to as WotLK or Wrath is the second expansion set for the massively multiplayer online role-playing game (MMORPG) World of Warcraft following The Burning Crusade. It adds a substantial amount of content to the game world including the continent of Northrend home of the eponymous Lich King and a new character "hero" class.