Undead torch

Undead torch was an evocation/necromancy spell that set a corporeal undead creature ablaze with a chilly flame that damaged living beings.

Effects
Upon casting this spell, the targeted creature was engulfed in fire that damaged live creatures, but caused them no harm. The blue flames had a similar appearance to the "chill" effect created by a fire shield spell.

This spell had no effects on non-corporeal undead. Any affected corporeal undead creatures immediately nullified the effects of undead torch if they became non-corporeal.

Casting
In addition to verbal and somatic components, this spell required the material component of a live or preserved firefly or glow worm.

History
This spell was known to be used by wizards of the Cult of the Dragon.