Illumination, also called Holy Light, is the ability to produce light and heat from from the body. T
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Castiel making his entrance.

his ability is in the possession of God, and angels. It can be used to frighten demons and evil spirits, and even harm or destroy other supernatural creatures. Furthermore, it is capable of warding off demons to some extent. This ability also allows them to kill and exorcise demons by placing their hand upon their forehead It is very useful to protect whoever is with them, remove all sins of a person and their memories, can return someone's memories, redeem people of their sins and is used to destroy things which are obstacles or are possible dangers.