The Armillogion was a orrery-like device of unknown origin which depicted Nave's solar system. It was most recently held by the Tindremenes who—according to legends—used it in some capacity as a divination tool. How it functioned and any possible connection to any deities is unclear, as the guild tasked with its protection was highly secretive.

The device was housed within its own building in Tindrem's Vica Iudico, the Auspiciorium, where worship was a regular practice. Surviving records even indicate that the device is at the very least as old as Tindrem itself. It was functional until The Conflux shook Nave, consigning it to the depths of the ocean along with the whole of Vica Iudico.

The Armillogion—or at least parts of it—were salvaged from the sunken remnants of Vica Iudico and placed in a public chamber in the Clerus Magica atop Vica Levita. Despite centuries of effort, it never resumed functioning and remained an intriguing yet meaningless relic. And so it would remain, until the earthquakes marking the end of The Irruption caused the spires of Vica Levita and thereby the Cleris Magica as well to fall into the ocean. This may be where the Armillogion's remains rest today.

Descriptions from prior to The Great Washout refer to it as the “Astrarium Equatorium”, the “Sfaira Dachtylidion”, or simply the “Navion”. Sarducaan texts written in Ana'dil mention the “Destegua ba Helq-ha”, and Huérgar documents written in Lisan Abnu speak of the “Āsipūt-Barsalummatu”. Illustrations depict a room-sized spherical model of the solar system, with Sunna at its center and planets orbiting slowly around it.

Numerous treatises, spanning all eras, have presented theories about the device's origins, questioned its workings, or debated its accuracy. At one time, many even regarded it as a divine mechanism facilitating the creation of an empire.

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Prior to the release of Mortal Online's beta, a countdown was released on the game's website. Every day the counter would have a new image background, and the community quickly discovered that each of of these individual frames—193 in total—could be combined into a video.

The puzzle was not just about combining the frames into a video, however, but also deriving the information stored in them. Foremost were the names of the planets in Nave's solar system, their individual number of moons, and their order by distance from Sunna.

Second was a “prayer” directed at or a “response” received/interpreted from the Armillogion in a religious language and encoded in the puzzle as a musical staff:

am nave diluvi
am nave flagrati
effogo potes ti
fatuu et pysma
armillo gia
servatis clade

Third, for stylistic purposes, a real-world page from a 15th century Cantorinus and two texts written in Palestinian-Aramaic were included, though they are not relevant to solving the puzzle.

Fourth, a document key to unraveling the mystery of the “prayer”/“response” was included around frames 110 and onward which is not among the three mentioned above, though this item has never been identified.

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