Frigid Woe

Frigid Woe is a special disease developed by one of Aeor's most powerful mages, Ferol Sal, that cannot be cured by conventional treatment or magic. The only way a creature or person infected with this disease can be cured is by finding and drinking the manufactured antidote, a pink milky liquid stored in gold vials.
This disease was created to slow down the forces of the gods and get around the healing power of their clerics and angels. The disease is transmitted by breathing in or coming into contact with blue spores that Ferol created long ago.
There seems to be 6 total phases of this disease, starting from feeling weak and slightly ill with a mild cold to being completely frozen in a dark blue glass-like statue. There has been no reported success stories of any creature or person that has made it to the statue phase who has recovered.
— there isn't much about how long it takes to reach each phase, as the research was not fully completed. The only data the book describes shows that it takes anywhere from 1-4 days per phase for the average person.