World of Warcraft: Wrath of the Lich King is the second expansion set for the Massively Multiplayer Online Role-Playing Game (MMORPG) World of Warcraft, following The Burning Crusade. The game added a substantial amount of new content into the game world, including the new continent of Northrend, home of the eponymous Lich King and his undead minions. In order to advance through Northrend, players are required to reach at least level 68 and the level cap for the expansion is 80. The first hero class was introduced, the Death Knight, that starts at level 55. More: en.wikipedia.org.