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“All right. Let’s not celebrate just yet. We need to capitalize on the momentum we’ve gathered with our little bombing mission. We’ve spotted a workable Horde demolisher-class catapult in the field below. The geist seem to be taking it apart.
If you can put it back together, we’ll be able to do some serious damage to the Scourge’s armies in the Valley. Sure, you’ll be a little outnumbered, but I’ve a lot of faith in you!”
-Thassarian
Thassarian, aboard the Skybreaker, wants you to collect 5 Demolisher Parts from the Scavenging Geists and take them to the Wrecked Demolisher in the Valley of Lost Hope.

You will be able to choose one of these rewards:
You will also receive:
Upon completion of this quest you will gain:
Quest Giver: Thassarian – The Skybreaker, Icecrown (Alliance)/Koltira Deathweaver — Orgrim’s Hammer (Horde)
Objective: Collect 5 Demolisher Parts from Scavenging Geists in the Valley of Lost Hope and use them to repair the Wrecked Demolisher at [68, 52].
Quick Facts
Walkthrough
Getting the Parts
Repairing the Demolisher
Efficiency Tips
Lore & Secrets
An Alliance-Horde Salvage Job
There is a fun detail in the quest text that differs by faction. In the Alliance version, Thassarian explicitly notes that the vehicle is “a workable Horde demolisher-class catapult” that was spotted in the field.
The Alliance is salvaging Horde siege equipment abandoned in the Valley of Lost Hope. In the Horde version, Koltira simply refers to it as “a disassembled demolisher vehicle.” The implication is the same either way: the Scourge’s counterattack in the valley has left both factions’ equipment scattered, and desperate times call for scrounging whatever is available.
The Valley of Lost Hope
The Valley of Lost Hope is one of Icecrown’s major ground-level combat zones, serving as the frontline between the living forces and the Scourge. It sits between the faction airships above and the gates of Icecrown Citadel’s outer defenses (Mord’rethar, Corp’rethar, and Aldur’thar) to the west and south.
Repairing the demolisher here transitions the chain from the underground Naz’anak exploration sequence back into open-field military operations.
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“All right. Let’s not celebrate just yet. We need to capitalize on the momentum we’ve gathered with our little bombing mission. We’ve spotted a workable Horde demolisher-class catapult in the field below. The geist seem to be taking it apart. If you can put it back together, we’ll be able to do some serious damage to the Scourge’s armies in the Valley. Sure, you’ll be a little outnumbered, but I’ve a lot of faith in you!”

The valley under the Skybreaker is called the Valley of Lost Hope. Somebody sat down at some point and settled on that. The demolisher lay a few hundred yards north of Mord’rethar, the Death Gate, on the east side of the glacier.
The geists there had already stripped the machine down, which meant the five pieces I wanted were in their hands rather than buried under the wreck. They were far too occupied with the taking-apart to watch what came up behind them.
A Horde catapult, reassembled by a night elf on the orders of an Alliance gunship, to be fired into a valley named for the absence of hope.
The structure had taken no permanent damage. The parts were enough to get it running again, at least temporarily.
A working catapult on open ground below Icecrown Citadel is an invitation, and Thassarian’s instruction once Vikstone is strapped into it is simply to Do Your Worst.