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Difference between revisions of "Fabrial"
→Mechanics
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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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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.
==== Zinc ====
[[Zinc]] in contact with a gemstone will cause its captured spren to more strongly manifest, this parallels how allomantic zinc amplifies, or riots the emotions of others. {{book ref|sa4|7}}
==== Brass ====
[[Brass]] in contact with a gemstone will cause its spren to withdraw and its power to dim, this parallels how allomantic bronze diminishes, or soothes the emotions of others. {{book ref|sa4|7}}
==== Bronze ====
[[Bronze]] in contact with a gemstone will cause it to alert someone of objects, entities, or phenomena nearby by increasing its brightness. This parallels allomantic bronze, which can be used to sense allomancy, and theoretically, other types of investiture usage.{{book ref|sa4|8}}{{book ref|sa1|i|4}}
==== Pewter ====
[[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 parallels allomantic pewter, which is used to strengthen the physical attributes of its user. This also drains [[stormlight]] faster than other types of fabrials, which might be similar to how allomantic pewter 'burns' faster than most other metals. {{book ref|sa4|9}}
==== Tin ====
[[Tin]] in contact with a gemstone will cause it to diminish nearby attributes. Unlike other metals, this seems the opposite of its allomantic use, to increase sensory acuteness. {{book ref|sa4|10}}
==== Iron ====
[[Iron]] in contact with a gemstone will cause it to attract nearby substances. This parallels allomantic iron, which attracts metal to the allomancer using the metal. {{book ref|sa4|11}}
=== Modification with aluminum ===
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