Blizzard Entertainment officially announced the development of Wrath of the Lich King, the second expansion for World of Warcraft.
Wrath of the Lich King expansion was released worldwide, introducing the continent of Northrend, the new Death Knight class, and increasing the level cap to 80.
The Death Knight, the first hero class in World of Warcraft, was introduced, starting at a higher level and with unique abilities.
Patch 3.0.2 was released to prepare the game clients for the upcoming Wrath of the Lich King expansion, including changes to the talent system and abilities.