In the Cultivation World, many strange tales often speak of how invitations to an Immortal Cave can cause ill intentions in the recipient, leading to tragic outcomes.
To confidently entrust it to someone already signifies that the Immortal Cave's owner has even prepared for betrayal and death at that person's hands.
Precisely because of its unique nature, such things are normally extremely rare.
The reason some can still be seen now is that there's another, more common scenario regarding invitation tokens.
That is, some highly Cultivated Seniors, due to their Lifespan nearing its end or other reasons for impending death, have no attachments, no descendants, and no Disciples under them.
At the same time, if they wish to pass on their cultivation and treasures, they will leave behind some invitation tokens as proof and qualification for entry into the Immortal Cave.
They then set up some trials, hoping the Legacy will be obtained by a fated person.
