Editing Vyre's knife

{{item
|image=Mad Herald by Xabi Gazte.jpg
|type={{cat tag|Weapons}}
|owner=Vyre
|world=Roshar
|universe=[[Cosmere]]
|books=[[The Stormlight Archive]]
}}
{{uncanonical}}
{{update|sa4}}
{{merge|[[Raysium#Weapons]]}}
'''Vyre's knife''' is a bright golden [[raysium]] blade with a sapphire set into the pommel, used to kill the [[Herald]] [[Jezrien]] and trap his soul so that he couldn't be reborn.{{book ref|sa3|121}}{{book ref|sa4|84}}

== History ==
{{image|Fallen from Grace by Soph P.jpg|side=left|width=200px|[[Hnanan]] giving the knife to [[Moash]]/Vyre}}

The circumstances of the knife's creation are unknown. It was given by the [[Fused]] [[Hnanan]] to [[Moash]] (later known as Vyre).{{book ref|sa3|121}} Hnanan told Moash that [[Odium]] had tasked him with killing a god; Moash then used the knife to kill Jezrien.{{book ref|sa3|121}} Moash removed the knife from Jezrien's body,{{book ref|sa3|121}} but the subsequent fate of the knife is unknown. Moash noted that the Fused appear to be afraid of using the knife on Jezrien themselves.{{book ref|sa3|121}}

== Mechanics ==
The knife can kill a Herald by trapping the soul, preventing the Herald from returning to [[Braize]] as a "conventional" Herald death would.{{wob ref|12261}} Jezrien, while initially in a drunken stupor, quickly realizes that something about this death is different and claims to feel the knife drawing something from him into itself. [[Shalash]] and [[Kalak]] likewise instantly distinguishes it from previous deaths, as they could no longer sense Jezrien's soul.{{book ref|sa3|121}}{{epigraph ref|sa4|79}}

The knife "traps" the soul so it can't be reborn.{{wob ref|12261}} It functions by absorbing all of the Investiture that makes up the Cognitive Shadow of a Herald, running it down the length of the blade and into the gemstone set into the pommel.{{book ref|sa3|121}}{{book ref|sa4|84}} This process operates under similar principles to the [[Scadrian]] manifestation of [[Investiture]] known as [[Hemalurgy]],{{wob ref|8774}} where practitioners are able to steal part of an individual's [[spiritweb]] using metal spikes.{{book ref|mb4|part=ars}} It would cause debate among [[cosmere]] philosophers whether the knife's magical properties are in fact Hemalurgy or rather a related, but distinct, phenomenon.{{wob ref|8665}}

Following Jezrien's death, the sapphire set into the knife takes on a "subdued glow". The sapphire in the knife's hilt is specifically for Jezrien.{{wob ref|8798}} Whether the use of that specific [[polestone]] is mechanically relevant or only symbolic is unknown.

The knife shares characteristics with [[Nightblood]], as they both bleed black smoke and leave blackened wounds.{{wob ref|7374}}{{book ref|sa3|121}}

== Notes ==
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