The Grand Libraries in Huanglong are renowned for their vast databases, holding valuable information about the regions they represent. Their exact locations are kept confidential, but it is believed they hold answers to all questions one could ask.

The Grand Libraries are vital for Huanglong’s data security, managed by the regional Sentinels, accessible only to the Magistrates. They are rarely open to the public.

Jinzhou is home to one of Huanglong's unique database centers, managed by the Sentinel and controlled by the Jinzhou Magistrate. It uses time as an index and precisely records information related to the city's establishment, making it a comprehensive and objective resource. The class books of Jinzhou, stored in City Hall, hold important data collected since ancient times. This vast database holds answers to any question one may have about Huanglong's history.