Ars Arcanum

Contains spoilers

Overview

An in-world Ars Arcanum surveys Roshar’s Investiture: the Ten Essences and Surges, fabrial categories, and key Surgebindings—Windrunning, Lightweaving, Soulcasting, and Stoneshaping. It stresses Intent, Connection, and Commands, reports a queen of Ur commissioning anti-Investiture, and suggests systems beyond Voidbinding while questioning the Body Focus concept and fabrial ethics.

Summary

The author introduces the Ten Essences and their historical symbolism, tied to the Double Eye and the hourglass motif of the Knights Radiant. Heralds and Radiant orders are associated to these Essences, but the placement of Voidbinding and the Old Magic remains uncertain. The author doubts the literal reality of “Body Focus,” treating it as philosophical rather than mechanical.

The Ten Surges are defined as the fundamental abilities granted to Heralds and later to Knights Radiant: Adhesion, Gravitation, Division, Abrasion, Progression, Illumination, Transformation, Transportation, Cohesion, and Tension. These summarize the operative forces behind Surgebinding.

Fabrial creation is attributed to scientific method and the coercive imprisonment of spren. Altering fabrials include augmenters and diminishers, exemplified by half-shards and devices that modulate forces or sensations. Pairing fabrials split a gemstone to create conjoined reactions: Conjoiners (ruby) parallel motion, while Reversers (amethyst) invert it, each with constraints. Warning fabrials (Alerters) use heliodor, with range scaling by infused Stormlight.

Drawing on reports of the Assassin in White, the author outlines Windrunning’s Three Lashings. A Basic Lashing reorients spiritual gravitation to change directional pull. A Full Lashing, using Adhesion, welds objects nearly inseparably. A Reverse Lashing creates a localized gravitational attraction, most effective on airborne objects.

Lightweaving manipulates light and sound, requiring a mental image and Spiritual Connection to the intended illusion. Soulcasting transforms matter by Spiritual change, with results keyed to gemstone color, shaping Roshar’s economy and the tenfold elemental schema. Radiants can Soulcast without the same gemstone constraints as devices. Honorblades are noted as early mechanical imitations, with implications for other worlds.

Stoneshaping, used by Stonewards and Willshapers via Cohesion, is bounded yet versatile, shaping stone through Intent rather than heat. The author’s embedded agent reports three facets: stone’s willingness to respond; its Connection revealing past faces and events; and the need for Commands. Crucially, a queen of Ur reportedly Commanded creation of anti-Investiture, supporting theories of Intent-driven oppositional energies. The author notes this bears on debates with Foil and his aims regarding the aethers.

Who Appears

  • Ars Arcanum author
    Anonymous in-world scholar compiling Rosharan Investiture; analyzes Essences, Surges, fabrials, and stresses Intent, Connection, and Commands.
  • Queen of Ur
    Ruler credited with Commanding the creation of an anti-Investiture in the mountains of Ur.
  • Assassin in White
    Referenced source of reports that led to information on Windrunning and the Three Lashings.
  • Foil
    Addressee of the author’s aside; a rival theoretician seeking control of the aethers.
  • Embedded agent among the Stonewards
    The author’s field operative studying Stoneshaping; reports on willingness, Connection, and Command.
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