It is a made-up word. The analogy is "Werewolf" - this is a composite of "were"; from the Latin "Vir" or Old English "wer" meaning "man" and "wolf," the animal. A werewolf is a man that can change into a wolf.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
A werelight is a floating ball of magical light, think candlelight or mage light in Skyrim.