Editing Raysium

{{metal
|type=[[God Metal]] ([[Odium]])
|properties=Conducts [[Investiture]]
|world=Roshar
|books=[[The Stormlight Archive]]
}}
'''Raysium''' is the [[God Metal]] associated with the Shard of [[Odium]]. Its name is presumably derived from [[Rayse]], the original [[Vessel]] of Odium. It is rare and available only to a select few amongst Odium's forces.{{book ref|sa4|97}}

== Properties ==
{{image|Raysium Dagger by Connor Chamberlain.jpg|side=left|width=250px|A raysium dagger}}
=== Physical Properties ===
Raysium is a bright golden metal, so light it is almost white.{{book ref|sa3|121}}

=== Investiture Conductivity ===
Raysium naturally conducts [[Investiture]], drawing it in from any source. This applies to all of the [[Lights]], but also to spren - allowing someone to transfer spren between gemstones, including spren halves produced during the creation of pairing fabrial.{{book ref|sa4|84}} When using the soul-harvesting dagger, [[Raboniel]] removes the raysium strip and reinserts it in the opposite orientation in order to switch the knife from drawing Investiture into its gemstone to sending it back out, suggesting that the raysium only conducts Investiture in one direction. It is unclear if all raysium is polarized in this fashion or if the portion in the soul-harvesting dagger was specially treated.
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== Uses ==
As raysium's physical properties are unknown, most of its uses have to do with its ability to conduct Investiture.

=== Weapons ===
{{image|Navani's Notebook - Dagger.jpg|side=right|height=250px|Soul-harvesting dagger}}Odium's forces have been using raysium in weapons for several Returns leading up to the [[True Desolation]], utilizing the metal's Investiture conductivity to drain enemy [[Knights Radiant|Radiant]]s of their Stormlight, and also fill gems with Light.{{book ref|sa4|84}} The spears used by the [[shanay-im]] during the True Desolation are likely such weapons.{{book ref|sa4|5}}

Soon after the imprisonment of [[Ba-Ado-Mishram]] during the [[False Desolation]], a Fused known as [[She Who Dreams]] realizes that raysium could also be used to direct the soul of a [[Herald]] to a gemstone prison.{{book ref|sa4|84}} At least a few such soul-harvesting daggers have been created in the years since - the knife used by [[Vyre]] to kill [[Jezrien]] is one of them, and [[Raboniel]] is in possession of at least three more during the occupation of Urithiru: one gets destroyed while experimenting, one she uses to permanently kill [[Essu|her daughter]] (and is later used by [[Navani]] to mortally wound the Lady of Wishes herself{{book ref|sa4|106}}), while the other is charged with [[anti-Stormlight]] and given to Vyre to eventually be used against [[Phendorana]].{{book ref|sa4|102}} Yet another such knife is given by [[Mraize]] to [[Shallan]] so she can collect the soul of the Herald [[Kalak]] for the [[Ghostbloods]].{{book ref|sa4|82}}

The soul-harvesting daggers contain a gemstone set in the pommel, and when used to kill a Herald will trap the soul inside. This prevents the soul from returning to Braize, stopping the cycle of death and rebirth.{{book ref|sa3|121}} The gemstone used possibly corresponds to the targeted Herald, with a sapphire specifically being used to kill Jezrien.{{wob ref|8798}} When Vyre uses a dagger to kill Jezrien, [[Shalash]] distinguishes this death apart from others, as she is unable to sense his soul.{{book ref|sa3|121}} This process has similar principles to [[Hemalurgy]], though this would cause debate between [[cosmere]] philosophers on whether the daggers' properties are in fact Hemalurgy or a distinct, albeit related, process.{{wob ref|8665}} When charged with anti-Stormilight, the daggers are able to kill Radiant spren, which breaks the bond between the spren and its Radiant.{{book ref|sa4|104}} The behavior of the daggers when charged with other forms of light is unknown, as is how the gemstone of the dagger affects its behavior with spren.

=== Fabrials ===
Raysium has no known uses in cage construction, but its ability to transfer Investiture - spren, specifically - from one gem to another allows for a half-spren trapped in one half of a conjoined pair of gems to be transferred to another gem, not part of the original pairing. This can lead to an asymmetry between the movements of the two spren halves, as moving a larger gem a certain distance will now make its smaller paired counterpart move a larger distance.{{book ref|sa4|84}}

== Notes ==
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