Harmonic Auditor

The Harmonic Auditor is an elderly Elf found within the Tonal Auditorium of Rkindaleft. He has been experimenting on the Orsimer who've entered Rkindaleft, infusing their souls with Dwemer technology in an effort to attain perfection, despite destroying their bodies and minds. They follow his orders, and he considers them his children, referring to them as beasts before he transformed them. He is attempting to infuse his soul into the Vessel of the Auditor, a Dwarven Centurion under his command, in an attempt to shed his mortal body.

A Heart of Brass
Dorand discovered that the inceptive, transductive, astrictive pressure valves were locking the door to the Tonal Auditorium, which contained the whatever was controlling the Rkindaleft Orcs.

After entering the Tonal Auditorium, the Harmonic Auditor will send his vessel after you, as you have disrupted his work. Once the Vessel is defeated, the Auditor will explain what he was doing in the ruins, and how he sought to achieve perfection by infusing Orc souls with Dwarven constructs.

He then gives you the choice to kill him by closing the pressure valve sustaining him or to leave him alive. If you choose to kill him, he will let say his final words before going into a ragdoll state. If you choose to leave him alive, he will explain that he will likely go insane and that eventually die.

After returning to Glurbasha, she will ask about the Auditor. If you leave him alive, your dialogue will say that you left him trapped in a rotting immobile body.

Hidden History
An Indecipherable Tome written by the Auditor is found within a Forgotten Pack. Giving it to Cinosarion will reveal that it was written by the Harmonic Auditor, describing his goals to bind Orc souls with Dwarven constructs.

Conversations
"You have undone my greatest accomplishment. Generations of effort, reduced to parts. Come then, bottle fly. Trample your dung-stained feet about my workshop."

What are you trying to do here? "We were to attain perfection, every one of us. Total animus tuning is delicate work, but I had achieved its mastery. Then you brought it to ruin. You've seen the beasts? I changed them... saved them from themselves. I could have done so for us all."

"No, I am forever leashed to my mortal shell. Already my perfect children grow deaf to my call. End it, then. Close the pressure valve sustaining me and free me from this withered cage."
 * But now you can't?

"Then the corpse to which you've bound my soul will rot for decades. I will have no company but mindless, imperfect beasts. I will go mad, and years later I will expire. Please, end my suffering. You owe me that much. Please."
 * What if I don't close the valve?

"Please. You've proven my imperfection. Close the pressure valve. End my suffering."

Trivia

 * He is the author of Auditorial Notes, Declension 81u5.