The Sovyrian Stone is an enormous crystal, which the elves use to control the ancient portal arch that links Golarion to the fabled elven land of Sovyrian. In addition, the crystal also provides the power for all the aiudara or "elf gates" used by the elves to instantaneously travel across the world. Though the artifact is well known to all within Kyonin, it is well-hidden somewhere in the capital city of Iadara; few have ever laid eyes upon it.12
The true history of the Sovyrian Stone has been lost to the ages. Legends speak of the mythical elven hero, Candlaron the Sculptor, who created both the Sovyrian Stone and the elf gates that the elves use to this day.3 These elf gates form a network throughout the elven homeland of Kyonin and across Golarion. These gates, although thousands of years old, are mere copies of the far more ancient magical portals that exist on Golarion.
After the exodus of the elves from Golarion via the portal controlled by the Sovyrian Stone, the exiled demon Treerazer attempted to wrest control of the stone in 2632 AR and attempted to refocus the link away from Sovyrian and forge a connection to the Outer Rifts instead.1 This prompted the return of the elves and Treerazer's plans were foiled as a result.