After the collection of task dragons and snakes is completed, it is on the second floor of the narrow street library, and then it can be obtained from the bookshelf next to it.

After the exchange, you can take on the task to help you find five lost books.

These five books are Before the Sun and Moon, The Legend of the Dragon and the Snake Forever, Shadows in the Light of the Day, A Study on Geography and Hydrology of the White Night Country and someone's experimental records. After the communication, you can choose the corresponding clue.

Extension:

Note 1: The map cannot be lit until the task of "glimpsing the white night" is completed. Don't rush to find the "seven-day idol". There is no "seven-day idol" in Xia Yuan Palace.

Note 2: After completing the series of tasks, you can switch between day and night freely, and the world tasks and puzzles of Xia Yuan Palace are basically unlocked. If you encounter an unsolvable puzzle in the process of exploration, please complete this task first!

Note 3: After completing all the tasks in the series, open the Deep Sea Dragon and Lizard Group (40-body World BOSS) challenge → Shenhe breakthrough material.

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