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Quest Repairing the Orrery
Location Imperial Orrery, Arcane University
Released April 17, 2006
Size 18 MB
Filename DLCOrrery.esp
Xbox 360
Patch None required
Inside the Orrery
The Orrery itself
The names of the heavenly bodies around Nirn

Orrery is an official download for Oblivion that features a new quest to repair the Arcane University's Orrery. Completing the quest grants you a greater power that will fortify one attribute while draining another. The particular power that you receive is based on the phases of the moons, Masser and Secunda.

Harness the power of the stars. Rebuild the defiled Orrery and unlock the secrets of this Mages Guild Inner Sanctum. —Former Official Summary
The Orrery Pack allows you to help the Mages Guild of Cyrodiil repair the Imperial Orrery, an ancient dwarven machine with mystical properties. Bandits have stolen a shipment of parts destined for the Arcane University; if you can return them, the Orrery will function once more. —Official Summary

Gameplay Information[edit]

  • Items — 4 new miscellaneous items and 2 letters are included with the download.
  • Magic — 8 new greater powers are available once the Orrery is repaired.
  • Quest — Assist Bothiel in repairing the Imperial Orrery.


This letter was originally displayed on the official obliviondownloads.com website, which has since become unavailable. The text serves to provide background and context for the events of the download.

Excerpt from Official Guild Correspondence, 3E432

My thanks for the latest trove of information. I understand it is difficult to decipher the glyphs remotely; Arch-Mage Traven has not deemed it necessary for you to make the long trip from Morrowind to visit the Orrery personally. (I know what a hardship that must be for you; your interest in and dedication to Dwemer research has not gone unnoticed at the University.)

From what you have told me, I suspect that not only might it be possible to return the Orrery to a functional state, but we may unlock features that have been hidden to us until now. I have long wondered about the function of the console separate from the primary mechanism; these plans you have sent suggest it might have a significant use. I have seen repeated references to Masser and Secunda, and they are clearly somehow related to this particular section of the Orrery. To what end, I cannot be sure, but I would very much like to find out.
If your excavations continue, I wonder if you might be able to send me some spare parts? The Council has authorized you to send me several cogs, as well as a coherer, cylinder, and one of those fascinating tubes. Formal papers for the shipment should arrive sometime next month (you know how the Council tends to drag its feet, even when it can finally make a decision!)
Thank you again for your assistance with the Orrery. Perhaps someday I'll have the time to visit Ald-ruhn and see these ruins in all their native glory.


  • The door to the Imperial Orrery is present even without this download. If you use console commands to break into the Orrery without installing the download, the interior is simply an empty dome structure, scaled to be much larger than normal.
  • Bothiel has unused dialogue she was meant to use when in the Orrery in the base game, these lines can only be heard with this download, after completion of the related quest.