The Veridian Society originated in Imea, and before the Shattering, was a consortium of librarians and archivists who were in charge of some of Imea's largest colleges and schools. When the Shattering happened, they banded together and worked to preserve as much information as they were able. Immeasurable knowledge was lost as many of the archivsts and librarians fell to demons and devils, not possessed of the same abilities as the magi and their apprentices.
Where there is a will, there is a way.
Despite many setbacks, enough knowledge was smuggled out to begin anew. Of the most important records saved were that of Ba'gel, a prominent scholar within Venturis who witnessed the slaughter at the Eurdiaye festival and was at the epicenter of magic being sealed away. He details the defeat of one of the Dukes of the Underworld who was slaughtered just before the The Forgotten summoned the final Duke and their god, the Forgotten One.
The HQ is currently located in Barren Sands, founded by the initial refugees from Imea. There, it is currently run by Sarra Yeshana, the Lorekeeper, tasked with the duty of preserving what remains, and finding a way to restore what was lost.