How to solve the Silent Library puzzle in Baldur's Gate 3

The Baldur's Gate 3 Silent Library puzzle is a pretty simple one, though it might not appear that way at first. Just like the Thorm Mausoleum with its confusing murals, the Silent Library also poses you a riddle: What can silence the Nightsong? You'll need to find the answer to this question and whack the solution into the altar to get access to the Spear of Night—an important item for both Shadowheart and the Nightsong quest...
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