Witch-killing spell

The Witch Killing Spell allows a hunter to kill any malevolent witch. To date, it has been used successfully against only one witch. Sam and Dean first learn of this spell from Bobby

Procedure
Two variations of this spell have been used on the show.

Ingredients
The exact ingredients have never been mentioned on the show. Chicken feet though, is a confirmed ingredient. The quantity again was never mentioned. Just having chicken feet is not enough. It has to be properly chilled. Otherwise it renders the spell ineffective.

Incantation
In Shut Up, Dr.Phil, Sam and Dean planned to use this spell against Don and Maggie Stark. The ingredients were combined in a bowl followed by an incantation: Furor divina virtute in infernum eam detrude. The contents of the bowl are lit on fire. White smoke and steam rises, but nothing happens because the chicken feet weren't chilled.

In Man's Best Friends With Benefits, another variation was shown. The contents for the spell were filled in a bottle which had a cloth stuffed at the neck. The incantation this time is: Ego voco impetu delere...vos caelum et infernum. The cloth is set on fire and the bottle is thrown like a molotov. Spencer was killed by this variation of the spell.

Effects
One the spell hits the witch, a swirl of smoke engulfs the witch as he turns into blood & ash and disappears. This spell unlike the demon killing bomb affects only an individual, rather than everyone in the spell's radius.

Appearances

 * In Shut Up, Dr.Phil
 * Man's Best Friends With Benefits