The message Qi Wuheng conveyed to Lu Xuan did not reveal any detailed information about the Thunder Sea Secret Realm.
It might have been that the secret realm was too significant. Even with his identity as the Thunderfire Star Cave's Star Envoy, he might not have known, or it involved many secrets that he intentionally hid from Lu Xuan. Alternatively, it was possible that considering Lu Xuan was at the "Early Core Formation stage," knowing too much would be counterproductive.
But, regardless of the reasons, the fact that he took the trouble to give a reminder was quite commendable, and Lu Xuan felt only gratitude in his heart.
He clearly understood that no matter how mysterious the secret realm was, it merely held some fortuitous treasure items. Being able to receive rewards from the Light Cluster made him not envious.
"It's just that more high-order cultivators have entered Thunderfire Star Cave than usual, but there is no need to worry too much,"