From wow.incgamers.com

The naaru are a dimension-travelling race of sentient energy beings with a deep affinity for the Holy Light of Creation that empowers the paladins of Azeroth. They are bent on stopping the Burning Crusade. The naaru blessed the draenei with this power in an effort to help them in their struggle. This makes them a natural ally of the Alliance races who embrace this holy power.

History

When Sargeras and the Burning Legion came to the world of Argus and began corrupting the Eredar race, Velen, an eredar leader, prayed for help. The naaru appeared, offering to take Velen and any other like-minded eredar to safety. Velen and his faction accepted and began to call themselves Draenei ("Exiled Ones"). The draenei hastily escaped Argus aboard the Dimensional Ship provided for them by the naaru.

During the draenei's journey, the enigmatic naaru race blessed them with Light-given knowledge and power. The naaru explained that there were other forces in the cosmos that would stand against the Burning Legion. One day the naaru would forge them into a single unstoppable army of the Light. Deeply affected by the naaru's words, the draenei vowed to honor the Light and uphold the naaru's altruistic ideals.

Due to the interests of the Legion, and later certain Azerothians, in Outland, the naaru moved Tempest Keep to Outland for a more direct observation. The Keep was stormed by the Blood Elves, but the Sin'dorei found only a single naaru within the ship.

Technology

The dimensional fortress Tempest Keep as well as the draenei dimensional ship/city The Exodar are examples of naaru technology.

From what information we have it appears that the naaru have advanced knowlege of magic and access to otherworldly matierials and reagents that have not been seen. Tempest keep looks much sleeker than most buldings seen on Azeroth, however the texture slighty resembles that of "Wizard" archetecture. The only factual knowlege we have is that Tempest Keep has "automated" defenses, the ability to fly, and teleport itself and anything in it.

It can be overwhelming to the lore considering that these features are easily associated with Science fiction movies, but if one looks at it logically it is not so technological after all. The automated defenses are most likely more powerful counterparts of the Arcane Towers built by the Kirin Tor. The necropolises (such as Naxxramas) that the Scourge employ can also fly and move vast distances, so that ability can also be obtained through magic.

In short, the goblins or the gnomes are more advanced than the naaru in terms of sheer technology. What the naaru use appears to be actual machines, almost as advanced as that of the gnomes or goblins, but greatly enhanced by deep and powerful magic, to the point where they give the illusion of having highly advanced, sci-fi technology.

"While we will be introducing a number of naaru technologies (like this ship, for instance), we're not planning on going hog-wild." (Chris Metzen on lore)

Usage

"Naaru is pronounced by holding the "a" sound for slightly longer ("NAA-roo").

Speculation

• Speculation on the origins of the naaru suggest that perhaps they were allies of Sargeras when he was still fighting evil. Perhaps Sargeras recruited these beings to aid him in his struggle, but later betrayed them when he was corrupted by evil.

• While essentially nothing is known about the naaru, there has been speculation that they are somehow related to the (non-titan) gods of Azeroth, such as Elune.

Known Characters

• The only known Naaru to be in the expansion at the moment is A'Dal, who is known as the "Kind and caring leader" of Shattrath City in Outland.