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In the aftermath of the Battle of Dazar'alor, Warchief Sylvanas Windrunner ordered Nathanos Blightcaller to set sail with the remnants of the Horde fleet. Using Xal'atath, Blade of the Black Empire as a compass, the Horde hoped to turn the war in their favor. The Alliance fleet engaged in pursuit, and both groups were ambushed by the naga as the sea opened beneath them. Trapped in Nazjatar, the ancient home of the naga, both factions were met by an ancient enemy: Queen Azshara, ruler of the naga and servant of the Old God N’Zoth. Meanwhile, Sylvanas Windrunner planned to execute Baine Bloodhoof for freeing Jaina Proudmoore’s risen brother Derek. Unbeknownst to her, Alliance and Horde forces were already on route to rescue the tauren chieftain. Upon meeting on the battlefield, the outfits led by Thrall and Jaina realized that only by working together they could hope to destabilize Sylvanas's command over the Horde, and decided to join forces. As Queen Azshara continued to dare those stranded in Nazjatar to face her, the champions learned from Magni Bronzebeard that a titan console was keeping N’Zoth prisoner within the Eternal Palace. As they fought their way through the Palace, the heroes discovered too late that it was a trap—though Queen Azshara was defeated, she successfully tricked the heroes into activating the console, releasing N’Zoth from his imprisonment. The Old God retrieved Queen Azshara and disappeared into the shadows, ready to once more unleash his terrifying might upon Azeroth. Left with no choice but to join forces completely against this new threat, the Alliance and the Horde headed into battle… but first, Sylvanas had to be stopped.