Sapphire Scales

Sapphire Scales is a rare and seemingly incurable disease which causes sapphire-like stones to grow on the victim's skin.

Description
Sapphire Scales causes the victim's skin to grow sapphire-like stones. The process can accelerate from exposure to natural light, whether sunlight or moonlight. Although the growth of the stones can be stalled by avoiding light, these stones will eventually cover the victim's entire body, leading to their death within a few years.

It is currently unknown how the disease is contracted, but it seems to be hereditary, considering Bonney developed it after her mother. The cure for it, if there is any, is also unknown.

History
Ginny somehow contracted the disease during her slavery in Mary Geoise. Because of this, she was released and returned to Sorbet Kingdom. However, due to prolonged exposure to sunlight during her trip back, she passed away soon after arriving.

Ginny's daughter, Bonney later started developing the symptoms of the disease and was forced to stay indoors during her childhood. This made her a target of mockery from other children, who taunted her and called her a "vampire" for not being able to go out in sunlight. When Bonney was five years old, a doctor estimated that she had at best five years left to live. However, Bonney has currently exceeded this estimate by two years and no longer shows any symptoms of the disease.

Trivia

 * The Sapphire Scales disease resembles the Greyscale from Game of Thrones, both diseases are extremely fatal and cause stone-like skin to cover the body.