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A '''fabrial''' is a [[
{{file ref|Navani1.jpg|text=Navani's Notebook: One}}
== Mechanics ==
{{image|Navani2.jpg|An excerpt from [[Navani's notebook]] depicting an Emotion Bracelet and examples of Stormlight patterns|side=right|width=250px}}
Creating modern fabrials requires trapping the proper type of [[spren]] in a gemstone cut for that purpose.{{book ref|sa3|33}} To trap the spren, artifabrians lure it to a gemstone with something it loves and knows well. Once it is lured into examining the gemstone, artifabrians drain the
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}}
=== Surge Fabrials ===
Unlike modern fabrials, the ancient [[Surge]] fabrials were created by persuading Radiant spren to manifest in the Physical Realm.{{book ref|sa4|9}}{{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}}
=== Reactions to Metal ===
Once trapped in a gem, spren respond to stimuli in consistent and predictable ways. The metal frame surrounding the gem creates the stimuli the spren react to - pressing metal against a flamespren in a ruby increases and decreases heat.{{book ref|sa3|33}} Spren react to different metals in different ways, with their behavior generally paralleling the [[Allomantic]] powers for each individual metal. Multiple fabrial gems can be placed inside a single wireframe, which lets them work together to create more complex results. The [[emotion bracelet]], for example, has ten gems, with patterns in which they light up corresponding to different emotions.{{file ref|Navani2.jpg|text=Navani's Notebook: Two}} The [[God Metal]] which [[Shardblade]]s are composed of can be used in fabrials.{{wob ref|14138}}
[[Zinc]] in contact with a gemstone will cause its captured spren to more strongly manifest.{{epigraph ref|sa4|7}}
[[Brass]] in contact with a gemstone will cause its spren to withdraw and its power to dim.{{epigraph ref|sa4|7}}
[[Bronze]] in contact with a gemstone will cause it to alert someone of objects, entities, or phenomena nearby by increasing its brightness.{{book ref|sa1|i|4}}{{epigraph ref|sa4|8}} The range of this construction is determined by how much [[Stormlight]] can be infused into the gemstone.{{book ref|sa1|i|4}}
[[Pewter]] in contact with a gemstone will cause it to express a certain attribute in force, correlated to the type of spren trapped in the gemstone. This also drains [[Stormlight]] faster than other types of fabrials, which might be similar to how Allomantic pewter 'burns' faster than most other metals. This metal is the one used to create augmenter fabrials.{{epigraph ref|sa4|9}}
[[Tin]] in contact with a gemstone will cause it to diminish nearby attributes. These are called Diminisher fabrials. Unlike other metals, this seems the opposite of its Allomantic use, to increase sensory acuteness.{{epigraph ref|sa4|10}}
[[Iron]] in contact with a gemstone will cause it to attract nearby substances.{{epigraph ref|sa4|11}}
[[Steel]] in contact with a gemstone will likely cause it to push away nearby substances, but artifabrians have not yet figured out how to make repeller fabrials.{{epigraph ref|sa4|11}}
=== Special Interactions ===
==== Raysium ====
[[Raysium]] conducts Investiture, allowing it to flow from one gemstone to another.{{book ref|
== Types ==
==== Conjoiners ====
Conjoiners are created from infused rubies which are split in half after the spren is already captured.{{book ref|sa4|84}} The two halves are then able to exhibit parallel movements over large distances. [[Spanreed]]s are the most widespread example of conjoiner, linking two pens and allowing for long-distance communication.{{book ref|sa1|28}}{{book ref|sa1|part=ars}} Conjoined rubies don't drain much Light to maintain their connection.{{book ref|sa4|63}}
==== Reversers ====
==== Alerters ====
Alerters use a heliodor to detect the presence of objects, feelings, sensations, or phenomena, and warn the user. There are alerters which can detect approaching people while excluding certain persons from detection.{{book ref|sa1|part=ars}} The [[Emotion bracelet]] is an alerter able to detect different emotions.{{file ref|Navani2.jpg|text=Navani's Notebook: Two}} Bronze is the metal used to stimulate these types of fabrials.{{book ref|sa4|8}} Theoretically, a fabrial could be used to detect emotional [[Allomancy]].{{wob ref|11576}}
{{image|Oathgate_Spren.jpg|An Oathgate as seen from [[Shadesmar]]|side=left|width=200px}}
== Trivia ==
* It is possible to create an analog computer using fabrials.{{wob ref|12568}}
* The term "fabrial" will, eventually, come to be used for all magic-based mechanical devices in the [[cosmere]], such as the mechanism that picks [[Elantrian]]s.{{wob ref|8621}}
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