Warcraft 3: Frozen Throne is the official expansion of the real-time strategy game warcraft 3 produced by Blizzard Entertainment, which was officially released on July 1 2003.

The game adds two series of new story battles, and further enriches the attribute data, arms units and heroes on the original basis.

Background settings:

During the invasion of Ash Valley by the Burning Legion, Illidan absorbed the energy of a powerful wizard artifact called "Gourdain Skull" and became a creature with demon appearance and great power, and gained some memories about Gourdain, especially about the tomb of Sargeras.

Then he met Kilgardan, who realized that his masterpiece, the Lich King, was too powerful to control, so he ordered Illidan to put an end to Naiozu and wipe out the power of the undead scourge forever. In exchange, Illidan will gain great power and occupy a place among the leaders of the Burning Legion.