This is a substantial expansion for the core World of Warcraft MMORPG, requiring the base game. Released in 2010, it fundamentally reshapes the original continents of Azeroth following the destructive return of the Aspect Deathwing. Gameplay is enhanced with two new playable races (Worgen and Goblins), the introduction of the Archaeology profession, and the ability to use flying mounts in Kalimdor and the Eastern Kingdoms. The story focuses on surviving the global cataclysm and confronting Deathwing alongside new end-game raids.
This worldwide disaster fuels renewed and intensified conflict between the Alliance and the Horde. The Horde finds itself under the leadership of Warchief Garrosh Hellscream, who aggressively seeks new territory and resources, leading to brutal confrontations in zones like the Southern Barrens. Meanwhile, the elemental forces, guided by Deathwing and the nihilistic Twilight's Hammer cult, seek to usher in the "Hour of Twilight," signaling the end of all life.
The narrative includes the "Rise of the Zandalari," where the ancient Zandalari tribe attempts to reunite troll races and reclaim lost territories, leading to conflicts in restored dungeons like Zul'Gurub and Zul'Aman, requiring champions from both factions to intervene.
Another key storyline involves the "Rage of the Firelands," where heroes assault the elemental realm of Ragnaros the Firelord on Mount Hyjal following his initial banishment. This culminates in a direct confrontation with Ragnaros in his own domain.
The ultimate confrontation centers on the "Hour of Twilight." Heroes must retrieve the powerful artifact known as the Dragon Soul, traveling through time to secure it from threats like the Infinite Dragonflight. The expansion concludes with a massive battle against Deathwing, culminating in the Maelstrom, where the Dragon Aspects ultimately sacrifice their powers to fuel the artifact, passing the mantle of Azeroth's protection to its heroes.
This expansion contains no further listed downloadable content or subsequent expansions released after its initial launch.

At the peak of his insanity, Deathwing the Destroyer fought to drive the world into twilight - a devastated future bereft of all life. The Dragon Soul, a powerful artifact lost in the past, was the only weapon capable of truly stopping Deathwing, and so the guardians of Azeroth - the Dragon Aspects - sent a number of valiant heroes racing through time to retrieve it. Despite being attacked by the mysterious Infinite Dragonflight as they travelled the timeways, the champions returned the artifact to the present and delivered it to the wise shaman Thrall. With his aid, the Dragon Soul was deployed against the Destroyer during a brutal battle that began in Azeroth's skies and continued into the roiling heart of the Maelstrom at the center of the world. Through the combined efforts of the Aspects and their allies, the madness of Deathwing was finally brought to an end.

After a ferocious series of battles, Azeroth's heroes banished Ragnaros the Firelord and his elemental minions from Mount Hyjal. Yet, threats to Hyjal persisted, including traitorous druids who had abandoned their allies and joined forces with the elementals. Fearing another elemental invasion, the defenders of Azeroth made a daring assault into Ragnaros' blazing realm: the Firelands. Among the seething flames of this elemental domain, Ragnaros was at his most powerful; only the greatest champions of the Horde and the Alliance, aided by druidic champions like Malfurion Stormrage, could dare hope to defeat the Firelord.

Alarmed by the terrible losses of life among all trolls, the Zandalari tribe traveled around the world to reunite their race and rebuild their once-powerful empire. The Zandalari restored the fallen cities of Zul'Gurub and Zul'Aman, and begun to conduct bloody raids on territories that had once been "theirs." The burgeoning troll force hoped to lead a great war against the other races of Azeroth, but the honorable Vol'jin of the Darkspear tribe stood against their murderous agenda, and recruited champions from both the Horde and the Alliance to invade the ancient cities and stop the onslaught.