Source: Isles of the Shackles, pg(s). 35
Several millennia after the collapse of Ghol-Gan empire, two powerful sorcerers known as Raugsmauda and Gray Whyrlis came to the Shackles and fought one another for control of the archipelago. They both uncovered the powerful sorceries that caused the doom of Ghol-Gan and attempted to harness them. In the end, however, the sorcerers failed to understand and control the powers they were using. In a disastrous incident, Gray Whyrlis was lost and Raugsmauda, heavily injured, was forced to retreat into her dungeon on Motaku Isle for centuries.