"The day when the five suns transition into moons? Now that you mention it, this centenary phenomenon is indeed going to take place in two months, but how does it have anything to do with the city's protective formation?" Fairy Silver Light asked.

Han Li was very knowledgeable in formations, and he quickly theorized, "On the day when the five suns transition into moons, the Yang energy of heaven and earth will be severely lacking; could it be that this formation draws its power from this energy?"

"Precisely, Fellow Daoist Han. Our four sects set up a Nine Sun Astral Formation in the city, and the more Yang energy of heaven and earth it can absorb, the more powerful it'll be. At the height of its powers, it wouldn't be impossible for it to kill even devilish lords. It's exactly because of this formation that the devilish army hasn't dared to launch an all-out attack against our city. Not only can this formation only be set up in a place where nine plots of earthly fire can be found, the materials required have exhausted almost the entire...