They seem to be allied with the Naga and fight against Neptulon.

World of Warcraft: Cataclysm brings new faceless ones within the Abyssal Depths ( Faceless Maulers and Faceless Shadoweavers) of Vashj'ir and the Abyssal Maw instance hub. In Ulduar faceless ones are led by General Vezax guarding the twisted passages leading to the Prison of Yogg-Saron. It would appear, therefore, that the darkest fears about the faceless ones are true. Much like gnolls or ogres, faceless ones have a 'battlecry': 'Shur'nab. Killing the Faceless Lurkers there is required for the quest Time to Hide. Multiple faceless ones appear including Herald Volazj, the leader of the Old God's forces, and Darkspeaker R'khem.ДЇaceless ones are also encountered underneath Icecrown Citadel in a place called Naz'anak: The Forgotten Depths. Interestingly, 'faceless ones' (see the Faceless Lurker), and ' forgotten ones' (see the mob known as Forgotten One) look similiar. Our misfortune cost us the war against the undead, and ultimately, our home.' implying that the nerubians discovered the faceless ones by accident. 'We inadvertently exposed a tendril of the old god's will, which was made manifest in the creatures known only as the Faceless.' He then goes on to say that they lost the war because 'In the end, we could not fight on two fronts against such powerful enemies. In the quests The Faceless Ones and Proof of Demise: Herald Volazj, Kilix the Unraveler and Archmage Lan'dalock say that as the nerubians fought the Scourge, they dug deeper underground as they lost ground to the undead. Volazj, a faceless one in World of Warcraft Eventually, they made it out of Azjol-Nerub and did battle with Illidan, but not until after surviving great peril. The undead barely managed to defeat the creature, but as more faceless ones appeared and the cavern began to collapse, they were forced to press on. He then told Arthas to 'fight as you've never fought before'. The crypt lord Anub'arak seemed stunned that such a creature actually existed, saying he thought they were only a myth. As they fought their way through, they soon encountered the monster who Anub'arak called 'A forgotten one'. But as they delved deeper into the ruins, they also encountered 'horrors' (as the dwarf leader Baelgun called them) released by Illidan's recently caused earthquakes: strange, vaguely humanoid beings that had arisen, and the giant tentacles of one massive creature. There they encountered still living nerubian freedom fighters and dwarves left over from Arthas' last trip to Northrend. During Arthas and Anub'arak's desperate flight towards Icecrown to defend the Lich King from Illidan and his army, they were forced to cross through the mostly underground nerubian kingdom of Azjol-Nerub.

Faceless agent