This alternate version of the history was described in the War of the Ancients Trilogy, the 3 books by Richard A. Knaak. This alternate version was created by 3 characters from our current time traveling back in time 10,000 years and witnessing firsthand the events of the war unfolding, and eventually being responsible for changing key aspects of it.
It is not currently known whether Blizzard considers the War of the Ancients Trilogy as the official, authorative source of the 'true' history, though certain aspects of our current timeline do seem to suggest this.
What follows is a summary of this alternate history with special emphasis placed upon how it differs from the official version.
The following contains spoilers, if you have not read the book yet
Thrown back in time
Shortly after the end of the Third War, the human mage Rhonin, was looking forward to settling down with his wife, the high elf Vereesa Windrunner, but he is called away, once again, by his friend and mentor, the dragon-mage Krasus
Nozdormu, the timeless one, the bronze dragon-aspect, had barely managed to contact Krasus and draw his attention to a strange anomaly in the mountais of Kalimdor. Krasus convinced Rhonin to travel with him to Kalimdor to investigate.
Once there, Krasus, Rhonin and Brox discoverer a 'hole' in time. They are pulled in, and end up 10.000 years in the past, just before the original invasion of the burning legion.
Krasus finds he is much weaker than normal, his magical abilities almost totally gone. Rhonin on the other hand becomes far more powerfull. They believe this is somehow tied to the existance in this time period of the Well of Eternity, the fount of magic the night elves wield as the centre of their culture.
Meanwhile, the young night elf Malfurion Stormrage is becoming more adept at the druidic magics his Shan'do Cenarius is teaching him. But in the process, he becomes more detached from the extravagant and arrogant ways of his own peopler.
His twin brother Illidan, on the other hand, would like nothing more than to be a powerfull caster of arcane magic, and to earn the respect of his peers, and the powerfull Moonguarde.
Both Falfurion and Illidan, are close friends with Tyrande Whisperwind, and apprentice to the Sisters of Elune. It is Tyrande who discovers the captured Orc Brox, who is unlike any creature they have ever seen. She treats him kinda and heals his wounds, gaining the Orc's respect.
Meanwhile Malfurion becomes concerned about a vision he recieves while in the Emerald Dream. It appears the High Borne, the powerfull mages of night elf aristocracy, are calling on something evil up in the tower of the palace. He can feel how the spell disturbed nature and the Well, and cannot believe that their beloved queen would not know of this strange and dangerous spelcasting.
Corruption of the Highborne
Lord Xavius is the one responsible for the strange spellwork that is happening in the palance of queen [Aszhara]]. He is convinced more power can be drawn from the Well of Eternity with a properly focused spell.. but he unlocks something far more than he could have dreamed off.
Across the Twisting Nether, the currupted Titan Sargaras stares back at Xavius, and utterly corrupts him. With Xavius' help, he influences all those of the high-borne, including the queen herself. From that moment on, they are focused on the single goal; of bringing Sargaras into the world of Azeroth, where he, and the armies of the Burning Legion, will clense the world of the unfit.
Krasus finds himself
Krasus notices that his, and his companions captivity, are being watched by one of his own kind. He managed to convince the dragon to take him to the queen of the red dragon flight, Alexstrasza, the aspect of life, and his long time companion.
Alexstrasza, in her wisdom, quickly understands the situation, even though Krasus is hesitent to tell much of the future knowledge he has. Krasus meets his younger self, Korialstrasz, and they both find they fair better in eachothers presence. Apparently Krasus and Korialstrasz cannot share a single time, as they are one and the same. This weakens them unless they are together.
The Invasion of the Legion
Xavius and the High-Borne summon Hakkar the Houndmaster.
The comming of the Legion
- Cut off from the well - Distruction of Zin-Ashari
Black Rook Hold
The battle against he Legion
The Betrayal of Neltharion
- The Dragon sole
The Betrayal of Illidan
The Well of Eternity
The Sundering of the World