Magic Stone Disease

Magic Stone Disease, also known as Petrification Syndrome, is an extremely rare Magic disease that turns the body of the infected into magic stone.

Background
Magic Stone Disease is known to exist in the Human World since the Human-Demon Wars or earlier, when Kishirika Kishirisu was ruling as the Demon Empress. She has knowledge of this disease, that is also passed to those who are given her Identification Eyes in recent times.

Cause
""I have no idea where the rat came from or when it got down there. Most likely, it sneaked into my luggage from the Demon Continent or while I was in Perugius' floating fortress. It doesn't really matter where it came from, though.""

- -Future Rudeus

Rats are the main carriers of Magic Stone Disease because some of them have resistance to it, whereas the infected individuals can be identified easily by their teeth that turns into violet crystal. Humans or other animals could be infected by consuming food contaminated by infected rats.

Infection
The pathogen of Magic Stone Disease is not airborne and infects orally, but it doesn't persist for very long and it disappears around a day, resulting in a very low infection rate. Moreover, it only infects pregnant women. When infected, the pathogen grows inside the fetus and proceeds to remold it into magic stone, which results in the death of the growing baby. At this point the mother also begins to exhibit symptoms of the disease, such as having fever and becoming bedridden. Finally, the body of the mother would start turning into magic stone (beginning from her feet), and she would also die in a few weeks if left untreated.

Treatment
Magic Stone Disease is only curable by God Rank Detoxification Magic. The only book for the chant of God Rank Detoxification Magic belongs to the Milis Religion in Millishion, where they have exclusive rights to it and is only made available for archbishop rank or above. Transcribing the book takes time since it is as thick as a dictionary, whereas stealing it would result in the perpetrators being labelled as the worst criminals by the Milis Religion and hunted down for life by Millishion's Holy Knight Orders.

History
""The fact that after changing history this way, in the end a favorable future for him awaits... Thus I will make you change history, to a future that will be favorable to me.""

- -Orsted to Rudeus


 * Hitogami plotted to kill Roxy Migurdia and her unborn child through the rat infected with Magic Stone Disease and succeeded.
 * 30 years later, Future Rudeus realized how Hitogami used the Stone Magic Disease to kill Roxy and travelled back in time to warn his younger self.
 * Future Rudeus died after talking with Rudeus, who later went to the basement and killed the rat, and later sent its remains to the Magician Guild for study.
 * Hitogami confronted Rudeus in his dreams for the failed plan to kill Roxy, but agreed to a compromise if Rudeus kills Orsted.
 * Rudeus was defeated by Orsted and became his subordinate against Hitogami, while Orsted agreed to protect his family.