Stormlight is a radiant energy given off by highstorms that can be stored in gemstones and then later used by Surgebinders or Soulcasters. Stormlight is a source of light and power and is used to power the technology of Roshar. Gemstones are much better at holding Stormlight than other objects because the light can remain within them for weeks. Usually, those gemstones kept in spheres (the currency on Roshar), can be infused with Stormlight by leaving them outside during a highstorm. Infused spheres can also be obtained from money exchangers. Stormlight leaks quickly when held by a Surgebinder or infused into an object other than a gemstone, though persons can slow the leakage by holding their breath (which they can do for an extended time while holding the light). It is theorized that Voidbringers can hold Stormlight perfectly.
Stormlight also has the power to heal, though Stormlight healing is far from instantaneous.
Stormlight is used by all Surgebinders to perform certain feats, which are akin to those performed by the Knights Radiant, which had ten Orders. Each Order possessed different abilities. However, Stormlight can be used by any Surgebinder to increase battle reflexes, reactivity, speed, and strength.
Stormlight can be used by Lightweavers to create illusions with light.
Szeth frequently uses Stormlight as a tool during his assassinations to kill his victims. But his powers, unlike those of others, does not come from a bond with any spren. It comes simply from wielding an Honorblade.
This page needs references. Please help improve this article by adding them.