Changes

This knife originally belonged to [[Ruby]] and is capable of destroying most [[demon]]s (albeit at the cost of killing their human hosts at the same time, i if the stab wound is in an immeidately immediately fatal place, such as the neck or heart). Its blade is inscribed with symbols and the handle is wood or bone. Of all the demons that have been stabbed with the knife, only [[Alastair]],<ref>[[4.16 On the Head of a Pin]]</ref>[[Abaddon]],<ref name="eight12">[[8.12 As Time Goes By]]</ref> and [[Cain]] <ref>[[9.11 First Born]]</ref> have been shown to be immune to its killing power. [[Sam]] noted at one point that [[Lilith]] was also scared of it,<ref>[[4.02 Are You There God? It's Me, Dean Winchester]]</ref> but she may simply have wished to avoid the pain rather than being actually vulnerable to the knife's power, or was unaware of the effect it would have on her. [[Bobby]] was able to survive stabbing himself with it while he was possessed, but the knife left him paralyzed from the waist down, and it was unclear if this killed the [[demon]] possessing him or merely forced it to retreat. It also has no effect on [[angels]],<ref>[[4.01 Lazarus Rising]]</ref> but it can kill [[hellhound]]s.<ref name="eight14">[[8.14 Trial and Error]]</ref>