Agnes (Abaddon)

Sister Agnes was minion of Abaddon, tasked with the job of stealing souls to turn into demons in Milton, Illinois. Sister Agnes was the only other demon to survive the encounter with Henry Winchester and Josie Sands at the St. Bonaventure Convent in Milton, Illinois.

History
However, in 2014, she starts to stealing souls again. During this time, near the end of the episode, Sam investigates at the convent. He discovers a number of jars with glowing lights in them. Just as he discover them, a demon arrives, and Sam kills him with the knife. Another demon, Sister Agnes, knocks Sam down, and then tells him that the glowing lights are souls. She laments that it has become more difficult to steal souls, but it is necessary to make an army for Abaddon. She tells Sam that there are other demons doing the same thing. Sam starts chanting the exorcism but Sister Agnes begins choking him so he can no longer speak. Sam pulls out his phone that has a recording of the exorcism and he then tosses the phone across the room. Sister Agnes lets go of Sam and dives for the phone in order to stop the exorcism. Sam kills her with the knife. Sam then opens the jars and watches as the souls go free to return to their bodies.

Power & Abilities
She has standard demonic power and abilities. But, as soul collector and demon recruiter, she have some abilities which unique to her.
 *  Demonic Possession - Like common demons, she required a human vessel or "meat suit" to travel on Earth.
 * Mind Control - She can make their victim to kill another people, made them felt guilty, and finally drove them committed suicide (by hanging themselves). So she can collecting their souls.
 * Immunity - She possessed resilence to holy ground, something which other lesser demons can't do. Not only can walk on holy ground, she even can made the convent as her lair.
 * Immortality - Like common demons, she have an indefinitely long lifespan and an arrested aging process.
 * Soul Collecting - Unique to her, she can collecting her victim's soul into some jars, although how and which method she used to is not known. The collected souls later can be sent to Hell and became new demons for Abaddon's army.

Weakness

 * Demonic Exorcism - Like common demons, she could affected by exorcism chant. Although its not fully exorcised her, the exorcism chant proved to be effective to distracted and weakened her enough.
 * Demon-killing knife - Demon-killing knife proved to kill her.