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“The Lich King’s tireless minions labor away night and day to assemble scores of abominations and flesh giants down there in the Fleshwerks. Yet, that is not enough. More and more skeletal constructors keep appearing to increase the pace of work.
If we do not discover where they’re coming from and how they’re able to work so quickly, we’ll be overrun before we can act in force. Search to the southeast and see if you can find the source of these skeletons.”
-Darkrider Ally
Investigate a Summoning Altar in the eastern part of the Fleshwerks, then report back to Darkrider Arly at Blackwatch.

You will be able to choose one of these rewards:
You will also receive:
Upon completion of this quest you will gain:
Quest Giver: Darkrider Arly – Blackwatch, Icecrown [35.4, 66.3]
Objective: Investigate a Summoning Altar in the eastern part of the Fleshwerks, then report back to Darkrider Arly.
Quick Facts
Walkthrough
Fly southeast from Blackwatch to the eastern edge of the Fleshwerks around [37, 70]. There are four Summoning Altars scattered around this area. You only need to interact with one.
Right-click any altar to investigate it. This spawns a Skeleton Constructor as a temporary guardian and completes the quest objective. Return to Darkrider Arly at Blackwatch.
Efficiency Tips
Explore Icecrown’s hidden easter eggs, lore mysteries, and connections across Warcraft history in Vikstone’s Icecrown Chronicles, along with the complete quest storyline.
Vikstone's War Journal“The Lich King’s tireless minions labor away night and day to assemble scores of abominations and flesh giants down there in the Fleshwerks,” Arly said. “Yet, that is not enough. More and more skeletal constructors keep appearing to increase the pace of work. If we do not discover where they’re coming from and how they’re able to work so quickly, we’ll be overrun before we can act in force. Search to the southeast and see if you can find the source of these skeletons.”

The altars are south of the ledge, along the path down to Corp’rethar. Stone, waist high on me, unattended.
There is nothing to investigate about them from the outside. So I used one.
You put your hands on the altar and a skeletal constructor comes up out of the ground in front of you, whole, and stands there waiting to be told where the Fleshwerks is. It does not need pointing. It knew before I did.
No one had to teach it anything. No one had to feed it, or house it, or convince it. That is how the pace is kept: they are not recruiting workers, they are printing them, and the printing costs nothing but the altar.
I left it standing there.
Arly heard the report out.
“I suspected such. We can’t let this continue. Our first priority is to destroy those summoning altars and then deal with the mess the Scourge has already created here.”
Killing what the altars produced would never keep pace with the altars themselves, and the only sequence that made sense started with Destroying the Altars.