Allurum

Allurum
Allurum is a condition caused by repetitive ingestion of the leaves of the Southern Corner Rimeberry. the Southern Corner is best known for its long and freezing cold winters, prevalent snows for 12 months of a 16 month year, and large expanses of swampy taiga that covers any area not reserved for farming or towns. The plants here have adapted for the freezing temperatures. 
This includes two different kinds of berries which will flower and ripen over the course of the quick 4-month dry season surrounding Longest Day. Verglasberries are typically red clusters which thrive in the swampy conditions and need to be mostly encased in water in order to grow and ripen properly. Rimeberries grow on thorny vines around the hefty pines of the Southern Corner forest. They will start to ripen before the frosts, but require time in freezing temperatures in order to sweeten. Rimeberries that have not weathered a few frosts are edible but are incredibly bitter and sour collectively. 
Herbalists and Apothecaries have both spent years trying to expand the use of these two plants by harvesting and experimenting with the leaves, roots, flowers, and thorns in search of medicinal purposes. While Verglasberry plants are very rich in vitamins and maintain their cooling properties making them a common remedy for colds, upset stomachs, and burns, the other portions of the Rimeberry plant have found to have mind-altering and addictive side effects. 
Rimeberry leaves, in particular, when dried, appear to be the most potent causing a temporary euphoria and are also a well-known aphrodisiac. The effects however are habit-forming and it takes very few uses before someone is physically addicted to the drug. This can result in a condition known as allurum. 
Those with allurum can suffer bouts of perceived hallucinations as well as the signature lilac color that the user's sclera takes on. It is not unheard of for addicts of Rimeberry leaves to recall enhanced abilities to see and converse with the deceased or with incorporeal spirits. Proof of this ability, however, has not yet been confirmed, and it is at this time considered to still be a hallucinatory response rather than genuine manifestations of abilities. 
There are groups of people and cults who believe that the symptoms of allurum are gifts rather than side effects, and they will collect together to ingest the leaves and perform ceremonies surrounding these abilities. 
While other medicinal herbs can assist with alleviating symptoms of allurum, only time without ingesting the drug can cure a patient with these symptoms (however many allurum sufferers prefer to continue with their condition and addiction. Rimeberry leave withdrawal is a long and difficult process).
Those looking to experiment with the substance are urged to do so with extreme caution and limited amounts in order to mitigate the possibility of being addicted to it.