Blizzard today provided the back-story for one of the most significant alterations to occur in the forthcoming release of The Burning Crusade - the ability for the Alliance players to create Shamans and Horde players to play as Paladins.

"One legend involves the noble leader of the Draenei, Velen, and his vision. Velen's vision was given substance in the form of Nobundo, a one-time Draenei priest who had devolved while the orcs decimated his race and tore the planet apart. Like his fellow Broken, Nobundo had lost contact with the Light, and so he ventured far into the deserts of Outland to meditate and pray for guidance.

After decades of silence, an unfamiliar voice finally answered his prayers. It was not the Light that whispered to him, but the wind. The breeze spoke to him of lost truths, of the might of the elements--of the delicate balance of power embraced by the shaman. Nobundo listened eagerly and learned all he could. When he judged the time was right, he departed the desert determined to use this knowledge to help the Draenei race.

Meanwhile, the Blood Elves busied themselves by establishing the fearsome Blood Knights. Their founding was made possible through the capture of a naaru from Tempest Keep by Prince Kael'thas Sunstrider. Kael'thas delivered the naaru to Silvermoon, where Magister Astalor Bloodsworn began months of study and experimentation on the naaru. Eventually, Astalor and his fellow wizards learned how to manipulate and corrupt the naaru's luminous energies. In the end the wizards devised a process by which the powers of the Light could be transferred to recipients who had not earned such abilities. Instead of feeding upon the naaru's magic, the blood elves would wield the naaru's Light-given powers themselves.

Lady Liadrin, formerly a priestess, had recently renounced her vows, for she felt the Light had abandoned her people. She learned of the wizards' achievement and volunteered to be the first to bend the stolen powers to her will. With her decision a new order was born: the Blood Knights. These renegade paladins are able to harness the sacred powers of the Alliance's noblest heroes."

The result of opening up both classes to each faction opens up exciting new gameplay opportunities, according to Blizzard, with players able to experience a class that was previously not available to them. Although both the Shaman and Paladin offer similar talents and gameplay as one another, it seems they will also enjoy unique abilities, similar to the priest class' racial specialties.

Look out for more on WoW: The Burning Crusade soon.