The Siege of Orgrimmar is a major raid in the game World of Warcraft, released in the expansion Mists of Pandaria. It involves players banding together to confront the corrupted Warchief Garrosh Hellscream in his stronghold, the city of Orgrimmar. This raid features a series of challenging encounters against various bosses, each with unique mechanics and lore. The siege is significant as it marks the climax of the Horde and Alliance conflict, showcasing the struggle against tyranny and corruption. Players must navigate through different sections of the city, ultimately facing Garrosh in a final battle that determines the fate of the Horde and its leadership.