How to get second-hand Youlong Yin Shi on the road?

Journey No.2 Youlong Yin Shi won the World boss, limited time activities, cornucopia and other activities. Acquisition method:

1, which can be obtained by treasure hunting with equipment.

2. Redeem in Meritorious Mall through Meritorious Value.

3. Killing all kinds of BOSS will drop the dragon seal stone.