An ancient evil lies dormant within Deepholm, the domain of earth in the Elemental Plane.

Hidden away in a secluded sanctuary, the corrupted Dragon Aspect Deathwing has waited, recovering from the wounds of his last battle against Azeroth and biding his time until he can reforge the world in molten fire.

Soon, Deathwing the Destroyer will return to Azeroth, and his eruption from Deepholm will sunder the world, leaving a festering wound across the continents. As the Horde and Alliance race to the epicenter of the cataclysm, the kingdoms of Azeroth will witness seismic shifts in power, the kindling of a war of the elements, and the emergence of unlikely heroes who will rise up to protect their scarred and broken world from utter devastation.

Gilneas is located on the peninsula south of Silverpine Forest.
The human kingdom had supported the Alliance during the Second War, but King Greymane had no qualms about severing all ties to the outside world when it became clear that the Alliance needed Gilneas more than Gilneas needed the Alliance. Unbeknownst to the rest of the world, darkness fell on Gilneas after the Greymane Wall's gates had been closed, and the worgen curse ravaged the nation. Before long, Gilneans were fighting against Gilneans in a bloody civil war that left the kingdom in tatters. Remarkably, the people of Gilneas have somehow managed to hold on to the last vestiges of their humanity... for now.

The preconception that any goblin would sell their best friend for a fistful of gold is not entirely unfounded: many of them probably would and some actually do.
The truth is that quite a few goblins combine a shrewd business sense with a certain level of... moral flexibility. For example, after the cataclysm reawakened a volcano on their home island one of the goblins' trade princes realized that there was good money to be made in offering panicked goblins a ticket to safety on his ship, taking their life savings - and then selling them into slavery. A clever plan, until it (and the ship) fell apart in a naval crossfire between an Alliance fleet and a lone Horde ship. The shipwreck's survivors washed ashore on the Lost Isles off the coast of Kalimdor, where they discover that the island's dense jungles harbor many mysteries and more than a few unpleasant surprises.

Originally the slaves of jungle trolls on the Isle of Kezan, the goblin race was forced to mine kaja'mite ore out of the volcanic bowels of Mount Kajaro.
The trolls used this potent mineral for their voodoo rituals, but it had an unexpected effect on the slaves who were in constant contact with it: kaja'mite generated a startling new cunning and intelligence in the goblins. Crafting their own powerful artifacts of engineering and alchemy in secret, the goblins soon overthrew their oppressors and claimed Kezan for their homeland. The mines that had been their prison, their slave camp, and the base of their rebellion now became the city of Undermine. Weaving through the heart of the island in a dizzying network of tunnels, vaults, and lava tubes, Undermine epitomizes the goblins' complex, unpredictable mindset.
The goblins' natural greed soon lifted them to prominence as masters of mercantilism. Trade princes arose during the First War as the cleverest goblins learned to take advantage of the strife. Great fortunes were amassed, and the Isle of Kezan became a hub for fleets of goblin trading ships. One of the trade princes agreed to lend his faction's services to the Horde in the Second War. Following the Horde's defeat, the goblins learned from their colleague's failed example, and soon they realized that their profits could double if they weren't stuck in such a restrictive relationship. By the end of the Third War, goblins were providing weaponry, vehicles, and devious services to both the Horde and the Alliance. This wouldn't last forever...

The worgen are a race of feral wolf-beasts whose very name inspires fear. Theories regarding their history abound, yet the worgen's origins remain steeped in mystery.
Records indicate that the worgen existed for a time in Kalimdor. In fact, more recent evidence suggests that their true origin might have a connection to the night elves and a secretive druidic order from Kalimdor's distant past. Yet until new evidence comes to light, this information remains speculative. The worgen's first verified appearance in the Eastern Kingdoms has been traced back to the Third War, when the archmage Arugal utilized the wolf-beasts as a weapon against the Scourge. Arugal's weapons soon turned against him, however, as the curse of the worgen rapidly spread among the human population, transforming ordinary men and women into ravenous, feral creatures. Arugal adopted many of the worgen as his own and retreated to the former mansion of Baron Silverlaine, the estate now known as Shadowfang Keep. The curse, however, was not contained. It persisted in the lands of Silverpine and extended even into the fabled walled nation of Gilneas, where the curse rapidly reached pandemic levels. The citizens of Gilneas found themselves trapped, with no hope of escape. They retreated deeper within the isolated domain, and there they survived, fearful of the savage presence that lurked just outside the barricades. Tensions among the displaced citizens escalated over time, resulting in a civil war that now threatens to destabilize the embattled nation even more. There are those among the Gilneans, however, who cling to hope. Many believe that a treatment for the worgen curse may exist, although others have nearly given up, fearful that if the barricades should fall, their humanity will be lost forever.