Upon reaching the thunder domain, the old man stopped in his tracks. Even with the attainment of the True Immortal realm, entering this thunder domain would invite certain inexplicable perils.
Furthermore, as a realm-guarding immortal, the old man still needed to handle external matters, covering for Lu Xiaotian on the outside, concealing the anomalies in this region, or suppressing probes from other realm-guarding immortals toward this side; the old man could still play a considerable role.
Stepping into this familiar thunder domain, Lu Xiaotian recalled the circumstances of his covert passage into the Immortal World back then and felt quite emotional. After so many years, he was about to undertake a similar endeavor once again.
As soon as he entered the thunder domain, Lu Xiaotian sensed a strong repulsive force ahead, seemingly intent on squeezing him out completely. This was the repulsion of realm power, requiring no one's control; it was simply a unique force formed where the spatial realms of the Spirit World and the Immortal World intertwined. It was precisely this power that protected the Spirit World, making it difficult even for powerhouses whose strength had been cultivated to the Celestial Immortal or even Golden Immortal realms to contend directly with this terrifying realm power. If one were blindly to fight and resist to the death, a Golden Immortal-level powerhouse would still be unable to withstand this immense pressure, and ending up severely injured or even perishing completely was a highly probable outcome.
Otherwise, if immortals could freely travel to the Spirit World, even if it were just a single immortal, it would suffice to stir up monstrous calamities within the Spirit World. How could the fragile Spirit World withstand such tossing? It would likely have been wiped out long ago. If it were directly connected to the