Many see the creators of the Emerald Nightmare in the Eternal Gods and of course they are absolutely right. The foul corruption that afflicted the domain of Yserra's Dream Lady was one of many vile creations of the servants of the Void, and, who knows, possibly more dangerous than the others, even including the Cataclysm brought on by the Deathwing, whose noble heart also succumbed to the whispers of the Eternal. Today, however, N'Zoth is considered the Lord of Nightmare and the one who pulls all the strings. But the truth is different and the one who gave birth to the greatest bane of the druids and other guardians of nature was Yogg-Saron, and not without the help of the druids themselves...

It is said that the Eternal God is not so easy to kill, and it is almost impossible to eradicate the world from its corruption. History, after all, knows of cases when works of art have enjoyed a much longer lifespan than their creators, which was also the case here. It must also be remembered that although the Eternal had already fought the armies of mortals and even suffered heavy defeats, the adventurers fought only against the "main" body, let us call it the torso of God, while its tentacles, like roots, were sunk deep into the bowels of the world. It was for this reason that centuries ago the titans were not tempted to make a second attempt to annihilate the Eternals, having seen the damage done to Azeroth by the uprooting of Y'Shaarj.

The extent of the Eternal Gods' influence, despite their imprisonment, was evidenced by an event that occurred 4500 years before the opening of the Dark Portal. It was then that deposits of the mysterious mineral saronite began to appear in the Northern Ridge and in many lands. The newly formed ore had unusual properties - it was much lighter, and at the same time much more durable than steel; it was also characterized by invulnerability to magic, especially nature. However, the advantages of saronite were appreciated thousands of years later by King Lish, who used it to build his fortress and strengthen his undead army. For the story of the creation of Nightmare, however, it was crucial to notice another property of saronite, which the druids of the time observed. They noticed that the mineral could contaminate the whole area, sucking the life energy from both the flora and the fauna of the land. They did not know that saronite was in fact the crystallized black blood of Yogg-Saron, as it was called in later centuries by the Fangzars. Perhaps if the druids had known the genesis of the mineral back then, their actions would have been more prudent...

The members of the Cenarion Circle deliberated for a long time on how to negate the threat posed by saronite. One of the most promising disciples of Malfurion the Tempestuous, Fandral the Stag, came up with a rather controversial solution. With the memory of sealing the power of the Well of Eternity with Nordrassil's World Tree and seeing the effect the aura of the Crown of Heaven had on the surrounding area, he decided that the method could also work for lands affected by saronite. Along with his followers, Fandral obtained six twigs from Nordrassil, which would become the seeds of more magical Trees. In keeping with his resolve, Fandral placed the seedlings at the center of saronite deposits in each of the lands that are now known by the names: Ashen Forest, Forest of Crystal Song, Feralas, Zaziem, and Twilight Forest. Nourished by the powers of the land, the tiny strains quickly transformed into monumental trees, and their power, as Fandral had predicted, was enough to stop the growth of saronite. Thus the five Great Trees were formed. In turn, the last of the tribes Fandral planted on the Northern Ridge, on the largest of the folds, creating the second World Tree, which was named Andrassil, or Crown of Snow. Fandral's deed was roundly criticized by Malfurion and the rest of the Druids, as Fandral had done all this without their knowledge or consent. However, it could not be overlooked that the bold plan was working... Until...

After a certain period of time, the druids observed a frenzy of amok spreading among the creatures of the Andrassil region. To their horror, it turned out that the World Tree was defiled and became the source of the disease. They realized that the Crown of Snow, unlike Nordrassil, had not been blessed by the Dragon Aspects, making it susceptible to the influence of the Eternal Gods, which Yogg-Saron ruthlessly exploited. Seeing no other way out, the druids decided to take a drastic step. With a painful heart they stabbed Andrassil, calling him from that day on Vordrassil, which meant the Shattered Crown.

However, despite the overthrow of the World Tree, there still remained five Great Trees. Each of them was closely related to the natural world, meaning also to the Emerald Dream. Each of them were also, like Vordrassil, devoid of the protective blessing of Aspects, allowing Yogg-Saron to use them as gateways for the rest of the Eternal Gods to slowly pour their foul powers into the dream dimension in secret and unhindered. And when their actions are finally noticed, it will be too late not only for the Emerald Dream, but for all of Azeroth...