This Black Cave King who achieved enlightenment was an ancestor from over 20 million years ago. It is said that after only three reincarnations, he was caught and killed during his period of weakness by a rival, which was very tragic.
His true estate was naturally emptied by that rival long ago, but the sesame-seed-sized benefits of the enlightenment site could never attract another Black Cave King to search painstakingly for it, hence its current emergence.
The enlightenment site is a bit far from Wuyang Academy, separated by roughly one-third of a planet, and is located in a range of barren mountains; that's why it took so many years to be discovered.
Fortunately, there aren't any powerful Demon Beasts there, most are in the Stellar Realm, occasionally a few in the Milky Way Realm, but none in the Comet Realm.
