Kruba det got this boa snake skin when he went to tudong in one cave while he was sitting samati doing meditation. He saw that one of the big snake die itself in the cave due to old age. Then kruba det do samati and realised that this snake is a very special snake which possess a lot of magical power.
It is the god guardian spirit snake for protecting the heavenly god and spirits in this cave.
The reason that it die is because the snake will to be born to next life.
The boa snake wanted kruba det to take it's body for doing amulet to help the people.
While kruba det was blessing these amulet, there were many boa snake crawl in to this ceremony. Then kruba det chanted and told all snake and inform them that the ceremony is finished already then all snake suddenly disappear into thin air.