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The so-called "secret realm," with "secret" signifying the unknown and "realm" representing an independent space.
Most secret realms were established by predecessors, some for trials, others for hiding treasures, and still others for military purposes.
No matter the purpose, they are ultimately meant for outsiders to enter, so their mechanisms tend to follow certain logical patterns.
However, there also exists a minority of secret realms that are naturally formed. These types often defy logic, with bizarre mechanisms so outlandish that they are incomprehensible.
For example, cultivators could usually summarize after a few attempts that the Pavilion Secret Realm of the East Sea had six challenges, each testing different things.
But in naturally formed secret realms, it is much harder to generalize—everyone who enters the relic encounters different things, so how could one summarize?
Unpredictability, unexpectedness, riskiness—these epitomize the Innate Relics.