[She was new, and so Day could give her information to bring her up to speed on what her peers knew.] Sometimes stars appear when weapons are drawn. I don't believe any one has worked out why yet.

Stars also appear when the towers are opened.

As for the demons [She gives a small smile which could be anything between cunning and sad.] Monsters appear when the towers are open, they may be the demons you have to fight as they are linked to the stars.

Your fellow students may be able to tell you more than me though.