It's late at night when Davian sneaks into the astrology tower, which he has never visited before,given he hasn't chosen astrology as course since it was bullshit to him and he wasn't acquainted with any Ravenclaws. But a hint in a book of the History of Salazar Slytherin points towards a specific crystal ball as the key to the Chamber of secrets, and he wanted to at least try it. He climbs up the endless stairs, quietly, so no teacher or prefect will catch him.