The Cyan Vast Sect was established over a hundred years ago. The founding patriarch, Daoist Qingtan, founded the sect at the age of ninety and vanished without a trace at the age of one hundred and twenty.

The so-called "immortal vanishing" is slightly different from achieving immortality.

Ascending to immortality requires undergoing a heavenly tribulation, while "immortal vanishing" means that a highly skilled cultivator has seen through the worldly affairs, hidden their presence in the mortal world, and can no longer be found by others.

It is said that Daoist Qingtan disappeared while drifting along a river, gradually fading into the vast horizon.