Ars Arcanum
Contains spoilersOverview
An in-world scholarly appendix surveys Roshar’s Invested Arts. It links the Ten Essences, Heralds, and Knights Radiant, defines the Ten Surges, and categorizes fabrials. The author details Windrunning Lashings, Lightweaving’s Spiritual requirements, and Soulcasting mechanics, while speculating about Voidbinding, the Old Magic, and ethical concerns over spren enslavement.
Summary
The scholar frames the Ten Essences as traditional Vorin symbolism forming the Double Eye, historically tied to Heralds and the ten Knightly orders. They note uncertainty about how Voidbinding and the Old Magic fit this paradigm, suspecting an even more esoteric system, and question the validity of “Body Focus” as literal attribute.
The Ten Surges are presented as fundamental powers granted to Heralds and Knights Radiant: Adhesion, Gravitation, Division, Abrasion, Progression, Illumination, Transformation, Transportation, Cohesion, and Tension—each defining an Invested capability rather than classical elements.
Turning to fabrials, the author asserts they are scientific devices created by enslaving spren. They classify augmenters and diminishers (enhancing or reducing forces and sensations), then describe pairing fabrials: conjoiners (ruby, parallel reactions; spanreeds) with conservation of force and distance limits, and reversers (amethyst, opposite reactions) with noted but unclear constraints. Alerters (heliodor) detect nearby phenomena, with range scaling by Stormlight and gem size.
Windrunning is explained through the Three Lashings. Basic Lashing alters gravitational orientation, enabling wall-running or flight and variable effective weight. Full Lashing uses Adhesion to bind objects with near-unbreakable bonds. Reverse Lashing grants an object a localized gravitational pull, most effective on airborne items and weak against objects grounded to the planet.
Lightweaving manipulates light and sound via illusions that require not only visualization but Spiritual Connection to the intended creation, aligning closely with ancient Yolish variants. Finally, Soulcasting transforms matter by altering its Spiritual nature, commonly via Soulcaster devices. Gemstone color proves crucial to outcomes (e.g., emerald for food), though living Radiants do not require such foci, implying a deeper link. The author notes Honorblades as early mechanical imitations and connects these insights to broader technological commoditization of Invested Arts.
Who Appears
- Anonymous scholar (Ars Arcanum author)
In-world commentator who catalogs Roshar’s magic, classifies fabrials, explains Lashings, and speculates on Voidbinding and the Old Magic.