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13.08 The Scorpion and the Frog
that was no pain at all then it would have been pain if he had changed his facial expression there were only very slight weak sparks from the wound that is more like weak damage
{{Weapons
|image=[[Image:thedemonkillingknife.jpg|350px]]
|name= Demon-Killing Knife<br>Ruby's Knife<br>Demon Blade
|Manufacturer= Kurds
|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:''' [[1415.01 Stranger in a Strange Land05 Proverbs 17:3]]
}}
{{Quotation
When [[Abaddon]] was stabbed by the blade, she survives despite experiencing intense pain, revealing that the [[Knights of Hell]] are partially immune to its demon killing abilities.<ref name="eight12" /> Unlike Abaddon, [[Cain]] stabs himself with the blade after Dean threatens him and suffers no pain or even any sign of exsanguination.<ref name="nine11" />
After surviving a killing blow from the knife by Sam, it was revealed that [[Ramiel]] and all [[Princes of Hell]] are immune to the knife's power and though like Abaddon, the knife caused Ramiel some paindamage, he didn't bleed from the wound when he pulled out the knife like Cain.<ref name="twelve12" />
==Episodes==
===[[14.01 Stranger in a Strange Land]]===
When they arrive at the diner in [[Detroit]] to meet with [[Kipling]] and rescue [[Castiel]], Sam hands Ruby's knife to [[Mary]] stating that it would be better if she takes it. After Mary and [[Bobby Singer (Apocalypse World)|Bobby]] ambush the restaurant, Mary throws the knife to Sam who turns to attack Kipling. During the fight between Sam and Kipling, they struggle for control of the knife which Sam ultimately loses. As Kipling comments that the knife is "cool," Sam suddenly grabs his arm and drives the knife into his chest, killing Kipling.
===[[15.05 Proverbs 17:3]]===
After seeing a resurrected [[Lilith]], Sam draws the knife, which Lilith calls a Demon Blade, while Dean draws an [[angel blade]], causing Lilith to comment that Dean upgraded.
==Trivia==
* 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]]. [[Lilith]] calls it a Demon Blade upon seeing the weapon in [[15.05 Proverbs 17:3]].
* 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]].
* 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]].
* In a deleted scene for [[13.08 The Scorpion and the Frog]], Luther Shrike inspects the blade, remarking it's craftsmanship looks Kurdish but is unaware of what dialect the markings come from.
* 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]].