The Star and Moon Treasured Mirror was not some strong and offensive spiritual treasure. It was only an assistive treasure. It only needed a little magic to activate it but this treasure mirror would be able to attract a large amount of starlight.
The method to make this treasure mirror was obtained by one of the Cold Fire Sect Integration level Elders from a secret realm tens of thousands of years ago. Because the Sect did not have a lot of star magic skills, and the creation of this artefact required at least ten times the treasured ingredients the usual treasures required, no one had dared to make it, despite how precious this jade scroll was.
Amongst which, the most important thing was that one of the main ingredients in the creation of the treasure was a special ingredient called "Yin Time Stone". This mineral stone was extremely rare and was something the Sky Ghost Sect saw as their most precious possession.