Holy Oil

"When the oil burns, no angel can touch or pass through the flames, or he dies."

- Castiel

Holy Oil is a very rare substance that can be found in Jerusalem. A circle of burning holy oil is so far the only way to trap a celestial being. Utilized properly, it is also one of the few substances that can kill angels, minus Michael. It also has a level of effectiveness against demons.

Characteristics
The angel will not be able to leave the circle, or both it and its vessel will face certain death. It should be noted that a circle of holy fire is not the equivalent of a devil's trap. When inside the circle, the angel still has use of some of their abilities and are able to move, they merely choose not to leave the circle out of fear of touching or passing through the holy fire. If an angel touches or passes through/over holy fire, then not only will the human vessel be destroyed and die, the angel will be killed as well.

Michael, however is resistant to the holy fire and could not be killed by it. This is seen in Swan Songwhen Castiel throws a holy oil cocktail at him. This is most likely because he is the oldest and most powerful Archangel. The Holy Fire is still extremely painful for him and can temporarily banish him. A Holy Oil molotov would probably kill any other Angel and Holy Fire is capable of holding at least Gabriel and Raphael, though the latter somehow escapes without being released. Its effect on Lucifer is unknown.

It's likely the oil can burn forever until it is extinguished with water, since Gabriel fears being trapped forever in the holy circle (however, he may not have meant this literally but, as he's immortal, it must be a long time to worry him).

Though Holy Fire cannot kill demons, it will cause them extreme pain, as demonstrated in Abandon All Hope... when Castiel threw Meg into Holy Fire.

Sam later uses it in Sacrifice to burn Abaddon when she attacks him and Crowley. She is caused so much pain she abandons her vessel Josie Sands and flees the scene.

According to the demon Word of God tablet, Hellhounds can be seen through an object scorched with Holy Fire. This is shown to be true in Trial and Error when Dean scorches two pairs of glasses with Holy Fire and he and Sam are able to see and kill a Hellhound.

Usage

 * Angels who have been attacked with holy fire:
 * Castiel
 * Raphael
 * Michael
 * Gabriel
 * Balthazar
 * Gadreel
 * Metatron
 * Josiah


 * Demons who have been damaged with holy fire:
 * Meg
 * Abaddon

Appearances

 * Season 5
 * Free To Be You And Me  (First appearance, used to trap Raphael)
 * Changing Channels (Used to trap Gabriel)
 * Abandon All Hope...  (Used to trap Castiel)
 * Swan Song  (Used to banish Michael)
 * Season 6
 * The Third Man  (Used to trap Balthazar)
 * The Man Who Would Be King  (Used to trap Castiel)
 * Season 8
 * Trial and Error  (Used to burn lenses, so they could see Hellhounds)
 * Sacrifice (Used on Abaddon, as a demon it didn't kill her but forced her to flee)
 * Season 9
 * I Think I'm Gonna Like It Here (Used to trap Gadreel)
 * Meta Fiction (Used to trap Gadreel and Metatron)
 * Stairway To Heaven (Used by Metatron to kill Josiah)