Argenvir

An argenvir (plural: argenvir) is a magical creature found in most timelines within Dimension Alpha whose x coordinate is less than 0. They are rare, semi-human beings, unique in being partially composed of essence (rather than essence-saturated like most magical creatures).

Description
Argenvir are humanoids of similar build and height to the average human. They have glossy, silver skin (fro which they derive their name), with small spots of medium gray, and white hair. They possess pointed ears, digitigrade legs ending in hooves, and a prehensile tail that is usually as long as the argenvir is tall.

Argenvir eyes are luminous, and one solid color throughout (lacking visible pupils or iris). The color of the eyes varies based on the emotion of the argenvir. Purple eyes denote no prominent emotion. Red displays anger, green happiness, blue sorrow, yellow stress.

History
Argenvir are descended from a monastic order in Europe, circa the 12th century. This order had fallen into quasi-cultic practices and been excommunicated long before by the Catholic Church. After the excommunication, they dropped any pretense of Christianity and focused solely on the study of magic and magic users.

The head of the order was concerned about the growing popularity of magic use and the potential for wrongdoing and misuse. He decreed that his followers should become guardians of the secrets of magic, and should create and enforce rules governing spells and spellcasting. Once his followers had decided whether to remain and support the new command or leave, he performed a forbidden ritual, intending to make them more "magically conscious and sensitive". As a side effect, they became the creatures they are now.

The argenvir accepted their new fate and willingly followed their leader, while moving into hiding. They carefully developed regulations of magic and secretly enforced them. In 1301 the Beachen Arde was formally established. All able-bodied argenvir of 13 years of age or older were considered enforcers.

Argenvir slowly spread across the Old World over the centuries following. Whenever a colony was established and became successful, a cohort of enforcers would be sent as quickly as possible. Argenvir are now found all over the world, excepting Antarctica. Even then, they may exist there, just in an undocumented fashion.