Tael Riverine
With the death of the Dagda Mor, Tael Riverine, Straken Lord, is the most powerful Demon within the Forbidding. Seeking a way to escape the realm of the Forbidding, he manipulated several treacherous Druids in the Four Lands opposed to the current Ard Rhys (High Druid), Grianne Ohmsford in an attempt to break down the walls of the Forbidding. He provided Shadea a'Ru with a powerful potion known as 'Liquid Night', which he convinced her would send Grianne into the Forbidding, where she could not escape from her banishment. However, he withheld an aspect of the magic: by sending Grianne to the Forbidding, a Demon would be transferred to the Four Lands, where Tael hoped that it would find a way to destroy the Ellcrys, freeing the Demons. After the switch, he sent out his Trackers to find Grianne Ohmsford, and they captured her and brought her to him. After testing her several ways, he deemed her fit to bear his children; but she managed to escape his castle with the help of an ex-tracker. Though he searched for her, he was unable to find her before she escaped the Forbidding.
Read more about this topic: Demons (Shannara)