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*In earlier seasons, the knife is generally called Ruby's
Knife by the characters. Its 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.*Hunters unconnected to the Winchesters don't appear to be aware of the knife's existence. In [[12.06 Celebrating the Life of Asa Fox]], [[Bucky Sims]] compares the temporary effects of an [[exorcism]] to the effects of an [[angel blade]]. In the same episode, when Dean shows the knife to the other hunters gathered, they are confused, causing Dean to have to explain what it is and its purpose despite the same hunters earlier talking about the Winchesters' legendary reputation.*Throughout season 13, the Winchesters did not use the knife to kill demons at all, instead relying entirely on angel blades despite the fact that demons were a major enemy in that particular season. Though the knife appeared in [[13.08 The Scorpion and the Frog]], the only demon killed with it was [[Grab]] by [[Luther Shrike]] while Luther was unharmed when Sam stabbed him with it. The knife was once again used by Sam in [[14.01 Stranger in a Strange Land]]. *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.*Before Sam uses the knife to kill [[Kipling]] in [[14.01 Stranger in a Strange Land]], the last time either of the Winchesters used it to kill a demon was in [[12.12 Stuck in the Middle (With You)]] when Sam killed the male demon protecting [[Ramiel]].*Occasionally, demons have expressed an appreciation for the knife such as [[Alastair]] in [[4.10 Heaven and Hell]] and [[Kipling ]] in [[14.01 Stranger in a Strange Land]]. In the latter case, Sam used the demon's distraction with admiring the knife to kill him with it.