Words of Radiance|
Glys is the spren with which Renarin Kholin has bonded that affords him the Surgebinding abilities of a Truthwatcher. Their bond grants him the Surges of Progression and Illumination.
According to Jasnah, Glys is one of the Voidspren. Such is not confirmed at this time.
Truthwatcherspren are suspected to be of Cultivation due to the Surge of Progression they afford their Surgebinders.