Radiant energy

Radiant energy was a type of energy associated with good and benevolent creatures, along with those associated with Positive Energy plane as well as the Upper planes.

Properties
This form of energy was extremely harmful to fiends and the undead, especially shadows.

Applications
The red great wyrm Imvaernarhro was known to have studied a variety of potent and unique spells, many of which harnessed the powers of radiant energy.