Nature is not always the best.
The Cave Heaven is a creation that inevitably appears when the Immortal Path reaches a certain stage. Cultivating in Cave Heaven bears fewer worldly shackles than cultivating in the normal world.
Just like now, many powerful figures from the Tianyuan Realm send their disciples to advance to the Purple Mansion in the Ancient Immortal Ruins because the Purple Mansion advanced here can align more closely with the Heaven and Earth Law of Primordial Void Origin. This alignment allows them to travel to other worlds without being restricted by local regulations.
Of course, it's also because whether their disciples live or die, succeed or fail, they can leave an imprint to help the Tianyuan people grasp the Ancient Immortal Ruins.
