Factions and locations
Various naaru factions exists in-game, some of which you can earn reputation with.
Current factions:
Draenei - Naaru of the Exodar.
Sha'tar - Naaru of Shattrath City.
M'uru, locked in place by a channeled drain spell
Prior to Patch 2.4, there was also an abducted naaru named M'uru within Silvermoon who was held captive by the channeling of Blood Elf sorcerers. This naaru was the source behind the Blood Knights (Blood Elf paladins) who drained the powers of the Holy Light from him.
At Kael'thas Sunstrider's signal the elves stormed the dimensional fortress, quickly defeating its automated defenses and claiming its satellite structures. The only real threat the elves discovered was a lone naaru who had stayed behind to maintain the keep's defenses. With some difficulty, Kael'thas subdued the energy being and sent it to Quel'Thalas so that the magic-addicted blood elves could feed upon it. Back in the capital city of Silvermoon, Magister Astalor Bloodsworn was not content with this idea. After long months of study and experimentation, he 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.
After patch 2.4, Kael'thas sent his Felblood minions to Silvermoon, and M'uru was taken