According to the Divine Sword Palace disciple's memory. Tang Yin had learnt quite a lot of things.
Firstly, a couple of thousands of years ago, a Divine Sword Palace disciple discovered this valley.
They discovered this lake of Myriad Spirit Milk. Not only that, but they had also discovered a Myriad Spirit Milk Source Stone!
The Myriad Spirit Milk Source Stone was an extremely precious treasure which was worth much more than Myriad Spirit Milk.
It could be placed inside a special environment, and over time, it would create Myriad Spirit Milk. It was essentially a goldmine.
Overjoyed, the Divine Sword Palace disciple returned to the Divine Sword Palace and reported their discovery to the Divine Sword Palace Master.
The Divine Sword Palace Master had then given the disciple a Spirit Array Disk.