The Moric
The Moric is a Changeling demon; it is capable of assuming not only the form but the personality of those who it imitates. Its true appearance is unknown.
When Grianne Ohmsford was sent to the Forbidding, the Moric took her place in the Four Lands. Setting out to end the Forbidding once and for all, the Moric assimilated an Elven Druid and set out to manipulate the Federation into destroying Arborlon, in order to destroy the Ellcrys tree. However, despite its possession of Sen Dunsidan, the Moric was tricked into returning to the Forbidding, where it met its end in the jaws of a dragon.
Read more about this topic: Demons (Shannara)