Deceiver

"'The...Blue...Man' - The Deceiver talking about The Librarian to The President"The Deceiver is an antagonistic figure present through the latter section of the second book, he makes a large impact as a powerful enemy due to his highly powerful and corrosive Illusion Magic. A brief glimpse of his detailed and woeful past is when The Librarian uses Illusion magic, his own technique on him and forces him to witness the pain of his tragic past, the natures of which are currently unknown.

Personality
The Deceiver seems very unconnected and detached from the rest of the world, he seems very bland and unemotional in the way that he talks he hasn't exhibited any emotions in his brief appearances within Book 2. With the rough way he speaks suggests that speaking for him is painful or causes discomfort for him, which is why he doesn't speak that frequently.

Powers and Abilities
Illusion Magic - The Deceiver has a high level of illusion magic, convincing people that things aren't there. Lightning - The Deceivers way of inflicting physical pain onto his enemies is through high power lightning attacks, typically formed in a spear, a lightning bolt.
 * Umbra - A third eye located in the middle of the Deceivers forehead, increasing the potency of his illusion magic, capable of alluding Miles while wearing the Librarians Armour.