Sergei

Sergei is a Shaman who acted as an ally to the British Men of Letters, when they were met with an unsolvable problem.

Background
Sergei was said to be an expert in magic and often aided the British Men of Letters, when they were met with an unsolvable problem. He had been contacted by Arthur Ketch several times though even though never met him in person. At one point, he met Gabriel helped him with a cloaking spell, obtaining some of Gabriel's grace.

Season 14
Castiel found Sergei through Arthur Ketch. As Castiel approached Sergei, he trapped him in holy fire. After learning that Castiel was alone, he released him. Sergei assured Castiel that his job is solving the unsolvable and gave him a spell and a vial of Gabriel's blood. As payment, he asked Castiel to tell the Winchesters that they owe him one.

As Sergei's spell didn't work and made Jack's condition even worse, he told him Castiel it was an experiment. Castiel threatened Sergei, that if Jack dies, he would find. An unfazed Sergei responded with "you can try".

Powers and Abilities

 * Shamanism - Sergei is skilled in the art of magic and is called a professional by the British Men of Letters who often sought him out.

Appearances

 * Season 14
 * Unhuman Nature

Trivia

 * He helped Gabriel in his hiding during The Apocalypse.