A fabrial was a mechanical device that used spren captured in gemstones to perform different tasks. There were five types of fabrial in three different categories.
Altering fabrials
Altering fabrials consisted of Augmenters and Diminishers.
Augmenters were fabrials crafted to enhance something, they worked best with forces, emotions or sensations.
The Half-shards of Jah Keved were augmenters, a fabrial attatched to a sheet of metal which enhanced its durabilityError en la cita: Etiqueta <ref> no válida; las referencias sin nombre deben tener contenido.
Diminishers were fabrials which did the opposite of an augmenter, they diminished something. They generally fell under the same restrictions as augmenters.
Painrials were diminishers, they reduced the amount of pain someone feltError en la cita: Etiqueta <ref> no válida; las referencias sin nombre deben tener contenido.
Pairing fabrials
Reversers and Conjoiners were both Pairing fabrials. Pairing fabrials were a fairly recent discovery during the times of the Vengeance Pact.
Conjoiners were fabrials involving an infused ruby which was split in half, the split halves would then create parallel reactions across a distanceError en la cita: Etiqueta <ref> no válida; las referencias sin nombre deben tener contenido.
Spanreeds were the best known examples of conjoiner fabrials.
Force is conserved in these reactions, moving one of the two halves requires an effort equal to that required to move both.
Reverses were created in a similar manner except with an amethyst instead of a ruby and they created opposite reactions.
Warning fabrials
There was only one known type of this fabrial, an alerter warned of a nearby object, sensation or phenomenon. Heliodor stones were used as the focus for this type of fabrial however it is possible that other stones may be used.