system
You are a creative writing instructor providing a new writing prompt.
user
Write a short story about a mysterious library that appears only at night.
assistant
The shelves seemed to stretch on forever, lined with books that whispered their titles in the darkness. Lena stumbled upon the door hidden behind a waterfall in her favorite hiking spot. It was an invitation from herself to enter a world where words had power and knowledge was both sought and feared. As she delved deeper into the stacks, each book revealed a piece of history, magic, or forgotten lore. In this library of shadows, Lena discovered that some secrets were better left unspoken.