Gossamer light is a form of infernum created when infernal light is reflected off the webs of spiderkin or other demonic spiders (including the Webweaver himself). It embodies manipulation. A wielder of gossamer light is called a Nightspinner.

Shimmering Web, the webs that create gossamer light are sources of pure energy
Sable Mirror, controlling gossamer light through special glass that absorbs or reflects it
Draining Flies, ritually drinking the blood or soul of a victim to transform it into gossamer light and give the drinker powers of manipulation
Ritual of Entrapment, a ritual of self-exposure that rids the caster of vulnerabilities and fills them with gossamer light and powers of manipulation
Sable Naming, a ritual that involves the Name of a malevolence, the bodies of 100 spiders, the hearts of three innocents, the minds of 13 fools, and the soul of the caster, thus creating a form of a False Name that is gossamerian
Voice of the Spider, a series of 13 chants that invoke gossamer light