Through the Prophet's Eye
Scarab Sickness is a Necroficing disease seemingly created by Mr Jacobs. The disease is manifested when tiny scarab constructs dig into a creature, and begin to slowly consume him from the inside out.
The victims of this disease often do not realize the gravity of the illness until it is far to late. The scarabs can mimic the functions of the flesh that they consume, and seem to anesthetize the target against the damage that they are doing.
In the end the victim becomes an servant of Mr Jacobs.