Zhao Hai finally knew the origin of the fire god city. It was actually a large Dharma artifact that could change its size. Most importantly, it came from the immortal world. It was probably one of the top Dharma artifacts there. Otherwise, it wouldn't attract so many people.
The Vermillion Bird was the one who had given him all the information he had. The Vermillion bird's information was mostly about how to use the fire god city. It did not mention anything about the immortal world, which made Zhao Hai a little depressed.
However, the fire god city was indeed a pretty good Dharma artifact. It could be said that the city was only a semi-finished product. As long as some materials were added, the city could still be upgraded. Slowly, the city could even be upgraded into a relatively independent space. People living there would be like living in a small world, and this was the use of spatial spirit stones.