Prolonged exposure to unrefined Stygium carries the significant risk of contracting Metastatic Stygium Conversion Syndrome (MSCS), an illness characterized by the growth of Stygium crystals within the body. Commonly known as Stygiosis, the illness initially manifests as dark spots on the skin, which progressively develop into visible crystalline formations. In advanced stages, these growths can encase entire limbs, potentially severely impairing movement. Furthermore, internal crystalline growth can lead to internal bleeding and organ failure, resulting in a drastically reduced average lifespan of under a decade post-infection.
Although feared, Stygiosis is not contagious through casual contact with living sufferers. Transmission occurs only through direct exposure to free-growing Stygium crystals or inhalation of its particulate form, found naturally at Collapse sites. Despite this, the visible symptoms of MSCS trigger significant social stigma, leading to widespread fear and ostracism of those afflicted. Sadly, discrimination against infected individuals is a common practice across Ziemian societies, though the severity may vary.
Stygiosis can sometimes grant the infected the ability to wield Stygium Arts naturally, without the need for an Evoker, the Stygium within the infected individual’s body effectively serving in its stead. These Arts tend to be significantly more powerful than those achievable with Evokers. However, this power comes at a steep price. Excessive use of Arts by an infected individual drastically accelerates the progression of their illness, as well as causing them significant pain. Additionally, lacking formal training, they are prone to accidents and self-inflicted harm.