Uldir was a titan research and quarantine facility where the titans conducted experiments on the Old Gods and dissected them to try to understand them. The titans' plan was to kill the Old Gods without ending their host: Azeroth.[1] They ended up accidentally creating something that could potentially wipe out all life on the planet, a fifth Old God named G'huun. It was locked away within Uldir via three seals, each located within the pyramids of Atul'Aman, Nazwatha, and Dazar'alor. With the fall of the last seal, nothing now prevents G'huun from spreading his rot and decay across the world.

For ages untold, Dazar'alor has stood at the center of the great and powerful Zandalari empire. Its guards have thwarted numerous attempts on King Rastakhan's life, and it has endured trials both ancient and new. But as war reaches the shores of Zuldazar, the Alliance embarks on a daring gambit to besiege the golden pyramid and sever the Zandalari's bond to the Horde.

A long-submerged evil stirs beneath the Shrine of the Storm. The whispers that drove Lord Stormsong to madness echo within the depths, a siren song of eldritch power. Those who listen and obey prepare dark rituals to carry out their master’s will. Whatever nightmarish schemes fuel their fanatical devotion, one thing is certain: they must be stopped.

Ten thousand years ago, as the seas engulfed Zin-Azshari, Queen Azshara forged a dark bargain with N'Zoth that transformed her loyal subjects into the sinister naga. Through millennia of brutal conquest, Azshara has built a new empire from the ruins of the old and now holds dominion over the depths that once threatened to claim her. Ever the gracious host, she has invited the Alliance and Horde alike into her eternal palace to witness her glorious ascension... and their ultimate demise.

Ny'alotha, the Sleeping City, has awakened. Under N'Zoth's command, the armies of the Black Empire threaten to engulf the world and reshape it according to their master's vision. Only one hope remains: using the repaired titan forges to eradicate the Corruptor once and for all. But in order to target N'Zoth with the forges' power, the champions of Azeroth must venture deep into the horrific realm for one final confrontation against the Old God.