an Entity references as follows:
The First Evil (usually called The First) is a fictional character created by Joss Whedon for the TV series Buffy the Vampire Slayer. The First Evil first appeared in the third season episode "Amends", and became the main antagonist of the seventh and final season. Its only real weakness is that it is non-corporeal, and therefore cannot cause any real physical damage. It is expert at psychological manipulation, and can act through its servants, such as the Bringers, Turok-Han, Caleb or whatever person it can manage to influence.