The First Eborius

The First Eborius was a prototype of Eborius constructs throughout the Castraversi, built from the hollowed-out remains of a Yújíba Elder well revered by the local populations as a respected being. The Ars took over the temple that was used to enshrine several of the relics, largely marked as their first act of aggression towards the Ará. The spot that the Elder was growing on was surveyed as an excellent conduit between the Subselar Boundary and the Selar the Ars originally made contact on. Once the connection was built the temple became a site of power, and within the next revolution the Yújíba was entirely gone, slain by the Oste building that took over its frame
The Yújíba Elders were used by the Ara as places of sacred learning, institutions designed to share the ways of their people. When they lost one to the Eborius that took its place it was a crush on their morale, and some historians now might say it was what led to their initial submission to Ars demands, watching the disrespect and destruction of their old ways to the hands of the people they trusted for protection took their desire to fight back and was what had them choose to relinquish their lands and become miners for the Ars.
The First Eborius led to the development of others on the various Selars, and once a sufficient number established a network over the landscape, the dimensional shearing was activated and the land was sealed away from the rest of the natural Framework. For most, the Eborius is entirely a symbol of everything the Ara would grow to hate, from the mimicry it gave off to their lost shrines, to how it keeps their ancestral homes cut off, it established Ars dominance but it hurt the Ara irreparably.
The knowledge of the breaking of the Eborius on Selar is thus a symbol in itself. The Ars rush to hide the truth. The Barakutashi rush to spread it further. A race for answers is the focus of the will of all the peoples.