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
|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]]
This knife originally belonged to [[Ruby]] and is capable of destroying most [[demon]]s if the stab wound is in an immediately fatal place, such as the neck or heart. Killing demons with the knife comes at the cost of killing their human hosts at the same time unless the vessels are already dead when they are possessed. When stabbed in less vital areas with the knife, the demon experiences intense agony but survives.<ref>[[4.10 Heaven and Hell]]</ref><ref>[[6.20 The Man Who Would Be King]]</ref> Its blade is inscribed with symbols and the handle is made from either wood or bone. Of all the demons that have been stabbed with the knife, only [[Knights of Hell]] such as [[Abaddon]]<ref name="eight12">[[8.12 As Time Goes By]]</ref> and [[Cain]]<ref>[[9.11 First Born]]</ref> and [[Princes of Hell]] like [[Ramiel]]<ref>[[12.12 Stuck in the Middle (With You)]]</ref> have been shown to be immune to its killing power. [[Alastair]]<ref name="four09">[[4.09 I Know What You Did Last Summer]]</ref><ref name="four16">[[4.16 On the Head of a Pin]]</ref> was stabbed in the left shoulder both times, although both stabs were very close to his heart. [[Bobby]] is the only known person to survive being stabbed with the knife, having stabbed himself to kill the [[demon]] possessing him at the time,<ref>[[5.01 Sympathy for the Devil]]</ref> but the knife left him paralyzed from the waist down.<ref>[[5.02 Good God, Y'All]]</ref> It also has no effect on [[angels]],<ref>[[4.01 Lazarus Rising]]</ref> but it can kill [[hellhound]]s if the wounds are fatal.<ref name="eight14">[[8.14 Trial and Error]]</ref>
The knife is "an ancient demon-killing knife of the Kurds" described by [[Henry Winchester]].<ref name="eight12"/> How Ruby was able to come across it before she met Sam is unknown.
The knife has has been used to kill demons, humans, and hellhounds.
The white-eyed demon [[Alastair]] was never killed by the knife's demon killing power since both times he was stabbed were on the left shoulder.<ref name="four09" /><ref name="four16" /> However, [[Sam]] noted at one point that Lilith herself was scared of the knife,<ref>[[4.02 Are You There God? It's Me, Dean Winchester]]</ref> and she continually took precautions to avoid being stabbed with it whenever confronted with it.<ref>[[3.16 No Rest for the Wicked]]</ref><ref>[[4.18 The Monster at the End of This Book]]</ref>
[[Crowley]], too, has always avoided being stabbed with the knife.<ref>[[5.20 The Devil You Know]]</ref><ref>[[6.10 Caged Heat]]</ref> While Crowley stated
in [[10.22 The Prisoner]] that the knife couldn't kill him, this may have been a bluff as he was later shown to be nervous in its presence when Dean pulled it on him after disabling him with an [[angel blade]].<ref>[[11.02 Form and Void]]</ref>
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
>[[8.12 As Time Goes By]]</ ref> Unlike Abaddon, [[Cain]] stabs himself with the blade after Dean threatens him and suffers no pain or even any sign of exsanguination.<ref >[[9.11 First Born]]</ ref>
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.<ref
>[[12.12 Stuck in the Middle (With You)]]</ ref>
===[[5.12 Swap Meat]]===
[[Dean]] tries to use the knife on the possessed [[Nora]].
===[[5.14 My Bloody Valentine]]===
While working on curing [[Crowley]] of being a [[demon]], [[Sam]] has the knife with him. He uses it to cut himself when he performs the [[exorcism]] that will finish the job, but Dean stops him before he can put his hand over [[Crowley]]'s mouth with the blood and finish the job.
===[[9.02 Devil May Care]]===
===[[11.06 Our Little World]]===
Dean tries to use the knife against Amara, but
his stayed by her thrall. Later when Sam breaks into the room and she attacks him, Dean moves after her again with the knife, but she flings him against the wall and leaves.
===[[11.15 Beyond the Mat]]===
Dean convinces [[Gunner Lawless]] to help him stop the rogue [[crossroads demon]] [[Duke]]. To this end, Dean arms Gunner with Ruby's knife. As Dean distracts Duke from the front, Gunner sneaks up behind Duke and stabs him through the back with Ruby's knife, killing him. Moments later, the [[hellhound]]s arrive to collect Gunner's [[soul]] since their master is no longer holding them back. Feeling he deserves what he's getting, Gunner returns the knife to the Winchesters before they depart, leaving him to his fate.
===[[12.12 Stuck in the Middle (With You)]]===
===[[13.08 The Scorpion and the Frog]]===
Sam arrives at [[Luther Shrike]]'s mansion under the guise of a seller who wants to offer him a knife that can kill demons. He presents Ruby's Knife to Shrike in a wooden box and claims that it is one-of-a-kind. Luther, seeing Sam's deceit, believes that he's a demon and attacks him with the knife. During the struggle, Sam stabs Luther, but the knife is ineffective as Shrike cannot die while he remains on the property. He knocks Sam out with a fossilized Gorgon tooth and takes the knife with him to go protect the safe. Upon arrival, Shrike uses the blade to kill the demon [[Grab]] before entering the room. He goes to attack Dean, but Sam distracts him and Dean punches Luther and retrieves the knife.