Two or three things about the secret realm

"A secret realm is a mysterious realm that is independent of this world."

some of them have existed since the ancient times. Some of them were created by cultivators using the wondrous way of heaven and earth.

"Since ancient times, many powerful beings would find or open up a secret realm that belonged to them, and refine it into their own cave abode. These secret realms that have been refined are hidden and safe. Without the key, there is no way to enter."

when a powerful being falls, some will hand over the secret realm to the sect or pass it on to their disciples, but there are also many people who, for various reasons, do not hand over the key, and these secret realms become ownerless.

almost every powerful cultivator with profound cultivation will accumulate a lot of cultivation wealth in the long years of cultivation. Pills, talismans, magic treasures, divine powers, these things are stored in the secret realm and may never see the light of day.