These short, scrubby, flowering plants can be made to give off light
only when exposed to the light of the full moon, or if some other
source of light (such as a pocket flashlight, cresset torch, or any
number of sorcerous devices) can be artfully used to simulate the
correct amount of brightness available from the full moon as seen from
above ground. Once excited by the proper level of light, the glowing
florets of the luminia can be rubbed on a person’s body.
Found mostly in the Westlands, this rare weed was at one time thought
to be extinct in the Eastlands, until a certain species was found by
Spike the Protector and renamed "luminia spikea." The importation of
luminia from the Westlands and its cultivation in the Great Underground
Empire would do much to protect the uninformed adventurer, the sort who
perishes each day from voracious grues and other dangers in the vast
network of Eastlands caverns.