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|name= Demon-Killing Knife<br>Ruby's Knife
|Powers= Can kill most [[demon]]s, humans, and [[hellhound]]s.
|location= Currently in [[Sam]] and [[Dean]]'s possession.
|episodes= '''First Appearance:''' [[3.01 The Magnificent Seven]]<br>'''Latest Appearance:''' [[
14. 01 Stranger in a Strange Land]]
* In earlier seasons, the knife is generally called "Ruby's knife" by the characters. In [[8.12 As Time Goes By]] refers to it as an "ancient demon-killing knife of the Kurds." It's referred to as just the demon-killing knife by [[Mary Winchester]] in [[14.01 Stranger in a Strange Land]]. Additionally, Dean calls it a demon blade in [[12.06 Celebrating the Life of Asa Fox]] and explains to a room full of hunters that it kills demons, "kills them dead." In [[12.15 Somewhere Between Heaven and Hell]], Dean calls it a demon knife when explaining to [[Gwen Hernandez]] how to kill a [[hellhound]].
* Though the knife played a role as the Winchesters main demon-killing weapon in the earlier seasons, it has lost its prevalence in the later seasons, particularly after the revelation that [[angel blade]]s can also kill demons. In the later seasons, the Winchesters use angel blades to kill demons more often the knife which then typically only appears once or twice a season.
* The knife was not used by the Winchesters to kill any demons in season 11, but Dean did attempt to use it against [[Amara]] twice and drew it on [[Crowley]] before deciding against killing him. It was used by [[Gunner Lawless]] to kill the [[crossroads demon]] [[Duke]] in [[11.15 Beyond the Mat]] however. This was also a season where demons were not a major enemy to the Winchesters due to the greater threat of [[the Darkness]].