what silences the nightsong

In the game Baldurs Gate 3, the Nightsong can be silenced by placing the "Teachings of Loss: The Nightsinger" book on the pedestal in the Silent Library. The Silent Library is located in the Gauntlet of Shar, and players must first defeat the justiciar duellists and disarm the trapped bookcases to find the book. Once the book is found, players can place it on the pedestal to solve the Riddle of the Night and silence the Nightsong.