Cuthbert Sinclair

Cuthbert Sinclair or Magnus was a rogue Men of Letters and a very powerful magician.

History
Cuthbert was the former "Master of Spells" of the Men of Letters, and served as Henry Winchester's tutor and friend. He was the one responsible for creating the warding that kept the Bunker safe. He proposed multiple measures and encouraged the Men of Letters to use their knowledge to destroy evil. However, the Men of Letters refused his proposals and eventually kicked Cuthbert out in 1956. Afterwards, Henry visited him several times to try to convince him to change and come back. Cuthbert however refused. Somewhere along the line, he made himself an invisible and intangible palace, which was only accessible by magic, and became a collector of rare supernatural antiquities, including monsters (which he placed in his zoo).

In 2014, now calling himself Magnus (after the Men of Letters code word for when they went incognito) he acquired the First Blade for his collection and later met up with Sam and Dean, who were hunting for the blade and claimed they wanted to talk to him about being a Man of Letters. Letting them in, the brothers tried to convince Magnus to lend them the blade. However, Magnus was more interested in discovering Dean possessed the Mark of Cain. He banished Sam, and kidnapped Dean to add him to his collection. He tried to convince Dean to agree, and when that failed, he began using his magic to brainwash him, as well as experimenting with the effects of letting Dean hold the First Blade. Using the spell from his premise, Sam broke back in, but Magnus captured him with the help of a shapeshifter from his zoo. Realizing he could control Dean through his brother, Magnus began to torture Sam with a knife. However, Crowley (who had followed Sam in) freed Dean, who killed Magnus by using the First Blade to decapitate him.

Powers and Abilities
Magnus was incredibly powerful and skilled with Spells, deemed a Spell Master by the Men of Letters. He was an extremely good strategist and worked wonderfully when on the spot.
 * Magic - Magnus was incredibly skilled at magic and spell casting, using them for a variety of purposes.
 * Immortality - He used his magic to keep him young, thus appearing in his late thirties despite being over ninety.
 * Apporting - Magnus used his magic to banish Sam Winchester from his home after deeming he didn't need him.
 * Theromokinesis - Magnus used a spell to cause Dean's blade to heat up so he could disarm him.
 * Brainwashing - Magnus used another spell to begin brainwashing Dean, robbing him of his desires. However it was a long process and he admitted it would take a lot attempts before he fully got Dean under his control.

Appearances

 * Season 9
 * Blade Runners