The angel banishing sigil, once drawn in human or angel blood and a hand pressed at its center, sends out a fierce light that banishes any angels within its blast radius. This sigil does no harm to the angels, it merely sends them to a different location on earth, their vessels included. It also doesn't harm the vessels they occupy. This is, in a way, a weakness for the angels. Once the sigil is activated, the angel it is affecting, temporarily has its grace inactive, so that it is rendered mortal. As a result, it cannot fly back to where he or she was banished. They cannot stop it, once in use. It can be activated by both humans and angels (in human vessels); it does not banish the angel that activated it, unless the sigil was carved into his or her vessel's own flesh.
- Season 4
- Season 5
- Season 6
- Season 7
- Season 9
Once Sam and Dean gain this knowledge, they frequently use it to defend themselves against angels.
- Sam and Dean first learned this from Anna Milton in Heaven and Hell, where she drew this symbol and banishes them for a while. Ironically they would later use it against Anna herself in The Song Remains the Same.
- In some of the symbol's later appearances, the sigil had less intricate designs, but were shown to be just as effective.
- So far they have used it at least once every season except seasons 8 and 10 since it was introduced.