法器（Fabrial） is a type of mechanical device, powered by 飓光 that uses 灵体 captured in gemstones to perform a variety of tasks. The types of spren that can be captured in a gem depend on the gem's type and color, implying that there are, "thousands of possible combinations," of fabrials that can be made. A fabrial-gem's power can be determined by the, invisible, pattern of Stormlight that gets filtered through the gemstone. These fabrial-gems are encased in a wire frame, it is not known whether this has an effect on the fabrial. Any surge can be replicated by Fabrial science. 
The term "fabrial" is often used colloquially to refer to the entire device. Artifabrians however use it to refer specifically to a gem with a captured spren, calling the entire device a machine.
通常在口语中用“法器”表示整个装置。法器师用“法器”专指捕获 灵体 的宝石，将整个法器装置称为机器。
- 欲寻 a full listing of known fabrial-machine designs，请见：:Category:法器。
Modern artifabrians divide the fabrials they design among five groups across three categories. The fabrials they create are all the result of scientific research.
变化类法器（Altering fabrials） changed something in some way, such as making something hotter or colder, increasing something durability, or eliminating pain. Artifabrians believe there is potential for greater types of fabrials in this category.
- Augmenters enhance or increase something; they work best with forces, emotions or sensations. Half-shards and Grandbows are examples of augmenters that increase durability. There are also heating fabrials that generate heat.: 此类法器可以增强某种事物，例如生成热量、疼痛乃至微风。半瑛甲、巨弓都是通过增幅型法器增强其牢固程度，还有的增幅型法器被用于取暖。
- Diminishers act as opposites of augmenters, decreasing something as opposed to increasing it. diminished something. In general they operate in a similar manner to augmenters, with similar restrictions. Painrials are an example of a diminisher that decrease pain.: 这类法器的效果与增幅型相反，两者适用和限制范围通常类似。止疼器就是用于减轻疼痛的衰减型法器。
配对类法器（Pairing fabrials） are, as the name suggests, created in pairs that can move in parallel, or the opposite, over great distances. This category was a recent discovery during the 复仇之战. Force is conserved between each pair of fabrials. The force required to move one is equivalent to moving both. Despite limitations in how far the fabrials can be separated and still work, which is affected by certain processes during their manufacture, conjectures about possible applications are being discussed.
- Conjoiners are created from infused rubies which are split in half. The two halves would then be able to exhibit parallel movements over large distances. Spanreeds are the most widespread example of conjoiner, linking two pens and allowing for long-distance comunications.
- Reversers are created in a similar manner to conjoiners, using an amethyst instead of a ruby. The two halves will then be able to exhibit equal but opposite reactions; lifting one would cause the other to be lowered.
警示类法器（Warning fabrials） detect things and give notice to the user. Their range depends on the the amount of Stormlight infused into its fabrial-gem.
- Alerters are able to detect the presence of objects, feelings, sensations, or phenomenon and warn the user. Alerters utilize heliodors in their design. There are alerters which can detect approaching people, which are able to exclude certain people from detection. The Emotion bracelet is an alerter able to detect different emotions.
In addition to the various fabrials artifabrians have developed over the years, there are a few that originate from the Heraldic Epochs.
- These fabrials mimic the the Radiant ability of 塑魂术. A soulcaster-fabrial consists of two rings and a bracelet connected by chains which hold a group of three gemstones across the back of the hand. Most are only able to effect small, singular changes, such as turning stone into water. About one in ten can effect any change. They can be activated by tapping one of the three gemstones when holding the hand against what is to be changed. They manipulate the Surge of Transformation.
- A female Stoneward possessed what appears to be a fabrial constructed from a large topaz and heliodor that was able to "regrow" and repair injuries. It manipulated the Surge of Growth.
- These fabrials manipulate the Surge of Transportation. There are hints that the Oathgates were responsible for the near-instantaneous travel possible during the Heraldic Epochs and were one of the only ways to reach 乌有斯麓. They could only be activated by living 碎瑛刃s, as wielded by the 光辉骑士团. Transportation of more than one person through the gates required use of more Stormlight for the ten gemstone lanterns within.
- 碎瑛甲 is occasionally referred to as a fabrial, it is not known if this is accurate since Shardplate appears to operate in a different manner.
- It is possible for synthetic gemstones to be used in fabrials.