The Yndru was a sequence of events that occurred around a thousand years ago, relative to the start of the campaign. These events were said to be world-spanning and world-altering. Based in ancient prophecies, the Yndru culminated in a vast war. Forces led by Kyriel Nightstar and the Heroes of the Yndru met the forces of an ancient enemy whose name has been forgotten, purposely. The forces of good triumphed, old gods vanished, new gods appeared, and it was said the sun itself moved in its course.
Much is lost to legend, the fog of history, and wild tales. But from the ashes of the Yndru rose the many new peoples and races, including the Dracon, the Forgeborn, the Revens, and the Halflings.