Warcraft III: The Frozen Throne is an expansion pack for the real-time strategy game Warcraft III: Reign of Chaos, released in 2003. It introduces new campaigns, units, and heroes, expanding the game's lore and gameplay mechanics. Players can choose from four factions: Humans, Orcs, Night Elves, and Undead, each with unique abilities and strategies. The expansion features a new storyline that continues the epic conflict between these factions, focusing on characters like Arthas and Illidan. Additionally, it includes a new game mode called Hero Arena and enhances the multiplayer experience, allowing for more diverse gameplay options and strategies.