Holy Oil is a rare substance. Castiel obtains some from Jerusalem, describing it as arid.5.03 Free To Be You And Me When the oil is ignited, its flames the celestial becomes trapped but can escape but most choose not too in fear of facing destruction.
Uses of Holy Oil
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Sam and Dean use it to trap the Trickster, forcing him to reveal that he is actually the Archangel Gabriel. Dean releases him by turning on the fire sprinklers
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Lucifer uses it to trap Castiel, but he manages to break the circle and escape by throwing Meg on the flames. The extent of her injuries were unclear, but she survives
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Castiel uses a molotov cocktail of Holy Oil to momentarily banish Michael
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Dean traps the angel Balthazar in a circle of ignited Holy Oil and forces him to return the soul he got from a boy, Aaron Birch, in exchange for a piece of the Staff of Moses. Castiel causes the circle to vanish with a gesture when he wishes to free the angel
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