Deep Holding Mantis Clip And Key To Yun Bai's Seal

Seeing as how the System already had information about it in the Data bank, Lin Wu understood that it was actually a well known spirit tool. 

Usually Peak grade spirit tools would be very rare and difficult to make. Thus, their numbers would take a while to grow over the years. This would also give the people enough time to learn about them.

Their sales and production would also be rather high profile and would get a lot of bids on them. After all, the Spirit tool refiner would advertise his creations as much as possible so that he could get back the value of his hard work.

It would also serve as a way to increase their reputation and skill. 

Thus, other than very few spirit tools that were intentionally kept secret, the rest would be well known in the cultivation world and be recorded in many places.