Demon Blood



Demon blood is the blood of a demon's vessel, effectively giving it supernatural properties. The blood from Azazel is responsible for creating people with special abilities in order to free Lucifer. Sam Winchester is one of these individuals. It once fueled Sam's psychic ability as well as his ability to exorcise demons. Sam is no longer consuming demon blood, so it is unknown as to whether his abilities are just lying dormant or if they're gone forever.

Demon blood is required by the vessel of Lucifer. Nick, when he served as Lucifer's temporary vessel, needed vast amounts to prevent Lucifer from burning through it. Sam had to drink several gallons of it to perpare his body for Lucifer's indwelling.

There is a great deal of controversy surrounding Sam's use of demon's blood, as evidenced by Dean's confrontation and Castiel's words of warning: "Your brother is headed down a dangerous road, Dean. So stop it. Or we will."

History
Demon blood saw its first appearance in Season 1 when Azazel was giving 6 month old children demon blood to create a future vessel for Lucifer. This blood soon created the Special Children and each developed their own abilities. It became known to Sam that he was fed demon blood in Season 2's All Hell Breaks Loose - Part 1 by Azazel.

In Season 4, Sam begins drinking demon blood when Ruby introduces him to the power it holds. Sam gained abilities such as exorcising demons with his mind and his abilities become increasingly powerful with every taste. Although humans were not meant to drink demon blood, only special children like Sam could and detox from it is quite painful. Sam is forced to detox after Dean discovers it in The Rapture and locks Sam in Bobby's Panic Room. When enough blood is drunk, it can permanently alter a person, although the effects are unknown. In Season 5, it is revealed that the host of Lucifer has to drink demon blood in order to hold Lucifer inside the body without bursting. Without his true vessel, Lucifer was forced to drink gallons of demon blood in order to keep his host's body, Nick, from burning up. When Sam prepared to let Lucifer in, he drinks about four gallons of demon blood.