Barthamus

Barthamus was a Crossroad Demon and the King of the Crossroads following Crowley's ascension to King of Hell.

Background
Barthamus was a Crossroad Demon who worked under Crowley while he was the King of the Crossroads.

In the 19th century, Luther Shrike made a deal with Barthamus to heal his terminally ill son. Barthamus held up his end of the deal, but allowed Luther's son to die a few years later of drowning. Luther was eventually dragged to Hell by Barthamus' hellhounds when the terms of his deal were up, but by then he had managed to get his hands on Barthamus' human bones. Using the bones as leverage, Luther forced Barthamus to resurrect him and grant Luther immortality on his property. Luther held onto Barthamus' bones to force Barthamus to leave him alone.

Following Crowley's ascension to the throne of Hell, Barthamus became the King of the Crossroads in his place. At an unknown point in time, Barthamus made a deal with Alice and kept his hellhounds from taking her soul to Hell in exchange for Alice working for him.

Season 13
In The Scorpion and The Frog, Barthamus sends a demon to steal a Nephilim tracking spell under the guise of doing it for Asmodeus. Once the demon has the spell, Barthamus kills him and his vessel with an angel blade.

After killing the demon, Barthamus contacts hunter Dean Winchester to offer a deal: the spell in exchange for the Winchesters helping Barthamus steal back his human bones from Luther Shrike. Barthamus brings in Alice and Grab to help with the job and threatens to give the spell to Asmodeus instead if the Winchesters don't help. The Winchesters reluctantly agree to the deal and Barthamus later appears outside of Luther's house to force Alice to keep helping following the death of Grab.

Moments after the Winchesters and Alice learn the truth from Luther, Barthamus appears and decapitates Luther with a machete, stating that Luther never should've left his house. Barthamus tells the shocked Winchesters that Luther had it coming and dismisses letting Luther's son die as the "fine print" that Luther never read. Barthamus pays Alice with a roll of cash and offers the Winchesters the second half of the Nephilim tracking spell. However, disgusted with what Barthamus has done, the Winchesters both refuse to trade the bones for the spell.

With the Winchesters refusing to cooperate, Barthamus takes Alice hostage to "reopen negotiations." Barthamus demands that the Winchesters turn over his bones in exchange for Alice's life, promising to "snap her neck like kindling" if they try to burn his bones and kill him. The Winchesters reluctantly slide Barthamus' bones out and Barthamus sends a terrified Alice out to retrieve them, disapprovingly stating that the Winchesters could've had the spell but they "couldn't make it easy."

Barthamus watches in amusement as Alice apologizes to Dean who tells her to "take care of you" and gestures to Barthamus' bones where Dean has left his lighter. Not noticing this, Barthamus orders Alice to hurry up. Alice walks over to the bones, then, as Barthamus watches on in shock, uses Dean's lighter to set them on fire. With a scream, Barthamus catches on fire and burns to ash along with his vessel, killing Barthamus. The fire from Barthamus' death ignites the tracking spell, destroying it as well.

Powers and Abilities
Bathamus possessed all the abilities of a regular Crossroad Demon though he was stronger than the average Crossroad Demon as the King of the Crossroads.
 * Demonic Possession - Like all demons, Barthamus required a vessel to walk the earth.
 * Immortality - As a demon, he would never die or age unless killed.
 * Invulnerability - As a demon, he was invulnerable to all normal methods of harm.
 * Super Strength - Barthamus stated that he could snap Alice's neck "like kindling" and held her prisoner effortlessly.
 * Super speed - Barthamus stated that he was fast enough to kill Alice in "half a second" and indicated that he possessed a great deal of speed.
 * Reality Warping (through deals) - As a Crossroad Demon, Barthamus could warp reality to fulfill the deals he made with people.
 * Healing - As part of his deal with Luther Shrike, Barthamus healed Luther's son of a terminal illness.
 * Resurrection - After being blackmailed by Luther, Barthamus was forced to resurrect him.
 * Power Granting - Barthamus was blackmailed by Luther into granting him immortality.

Weaknesses
Barthamus possessed all the weaknesses of a regular demon.
 * Burning His Human Bones - By threatening Barthamus' bones, Luther Shrike was able to leverage his way out of Hell. By burning them, Alice killed Barthamus.

Killed By
After being released by Barthamus, Alice used Dean's lighter to ignite his human bones, causing Barthamus to burn to ash.
 * Alice

Appearances

 * Season 13
 * The Scorpion and The Frog

Trivia

 * Barthamus is the second Crossroad Demon to be killed by burning their bones. Bobby Singer killed a female Crossroad Demon the same way in Weekend at Bobby's.
 * Barthamus' bones being used as leverage to force him to "renegotiate" his deal with Luther Shrike is similar to how Bobby Singer used Crowley's human bones to break his deal in Weekend at Bobby's.
 * Barthamus' death appears to have broken his deal with Alice as the hellhounds do not come after her once he is gone. This is unlike when Duke's death only resulted in the hellhounds coming after Gunner Lawless who was also forced to serve the Crossroad Demon holding his deal in exchange for not going to Hell.
 * Technically, Sam also counted towards a man who had been to Hell and back since he traveled to Hell in Taxi Driver to rescue Bobby Singer's soul. However, Barthamus may have been unaware of this or needed someone who had died and gone to Hell and then come back.