The Last Days
According to myth, Siberys is the name of one of the three first dragons, along with Eberron and Khyber, who ruled all. They discovered, or created, the Draconic Prophecy, and its words brought reality into being.
The remnants of the dragon Siberys can be seen above the world of Eberron, glowing in the night as a ring of golden Dragonshards stretching from horizon to horizon. These dragonshards occasionally plummet to Eberron and, like the Eberron and Khyber shards, are sought after for their various powers and uses.
Stretching above the Ring of Syberis and Eberron’s twelve moons lies the Sea of Syberis, also commonly known as the Astral Sea. Along this sea lie angelic astral cities, scattered among various planes of reality. Like the planes of Eberron and Khyber, the planes of Syberis will occasionally create manifest zones within our world, but constantly ebb and flow along our world’s borders, influencing our reality in numerous ways.