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=== Surge Fabrials ===
HowUnlike modern fabrials, the ancient [[Surge]] fabrials were created isby unclear,persuading butspren itto ismanifest likelyin athe differentPhysical methodRealm.{{book ref|sa4|46}} Their functioning is also different: for example, [[Soulcaster]]s require a request for aid, which is unnecessary in modern fabrials.{{book ref|sa3|i|4}} However, they still do involve spren being bound to gemstones in some way - two large spren can be seen guarding and controlling the [[Oathgates]] in [[Shadesmar]].{{book ref|sa3|116}} So long as the gemstones are preserved and the spren are not compromised, any Surge fabrial can be recreated to operate just as it used to.{{book ref|sa3|117}} Any [[Surge]] can be replicated by fabrial science.{{wob ref|3013}} However, in the present day, fabrials that use Surges are extremely rare, and most of them date back to the era of the [[Knights Radiant]].{{cite}}
In contrast to [[Surgebinding]] or [[Old Magic]], most fabrials can be operated by anyone, as long as they know how to do so (the only exception being the [[Oathgate]]s, which require a Radiant to activate, although that might be a security measure rather than a crucial design element).{{book ref|sa2|86}} Some, like heatrials, are even capable of functioning without human input.{{book ref|sa2|4}} The self-contained nature of fabrials sets them apart from most manifestations of [[Investiture]] in the [[cosmere]], wherein the magic is accessed and directed by the user (often with specific requirements or limitations).{{wob ref|10311}}{{wob ref|3488}}{{wob ref|6247}}
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