warning signal

Exploration Stage: Clock Tower
From: Carlos Light
Description: Vila said that the Alliance's inventions have marks on them that can only be seen by the Alliance's participants. Let's find out what the Alliance has made and find out how to find the markings. It is said that the first thing the alliance members made was a fog alarm. I had one myself, have you seen one anywhere?
Completed: This is the fog alarm. When the fog would suddenly come to rest, the crystal in the alarm would light up a few minutes before it struck, warning of danger and saving the city. I don't know the markings on the device yet, but I'll try to find out by applying various proofs.