Following

The next day, Ji An and the other entered the heart of the mountain range and arrived at the location of the seal. With the materials True Person Feiyun had prepared, he chose to enter directly.

From high above, everything was shrouded in mist. Even his eyes could not see through it; it was the concealment of the sealing formation.

The materials showed that there were five great mountains inside, arranged in the east, south, west, north, and center. This was the core inheritance ground of the Five Elements Sect.

The vegetation in this area had turned faint black, and the plants had become even more twisted. Demonic beasts also roamed about, each with blood-red eyes, crazed and bloodthirsty. At a glance, they were clearly no ordinary demonic beasts.

True Person Feiyun explained, "It is said that when the True Demon Tribulation ended back then, the core Spirit Vein Node here had already been completely contaminated, turning the Spirit Vein into a demonic vein.

"The sealing formation here should actually be called the Demon-Sealing Formation. It is a sealing formation driven by the demonic qi within the earth veins.

"According to the old pattern, the sealing power of the great formation periodically weakens roughly every five hundred years. That is when exploration is most favorable.

"During this period, the demonic qi within the sealed area escapes and contaminates the surrounding region.

"You must leave before the sealing power of the great formation becomes strong again. Once the formation is fully activated, even Nascent Soul True Lords will be cut off from both within and without.

"According to my clan's ancestor, when the sealing power is at its strongest, only cultivators at the Perfected Realm of the ninth Nascent Soul layer can temporarily break open the formation and pass in and