The World Source Secret Realm was famous in the East Demon Feather because it was of huge help to the Soul Accumulation in shaping their new world.
Its location was located in the World Source Wilderness, 3,500 kilometers north of the Lan Family's territory.
From the outside, this wilderness appeared as a desolate and treacherous land, filled with fierce beasts and rising poisonous miasma. Moreover, there were powerful seals in place, preventing any cultivators from attempting to enter.
Even if a powerful expert forcefully broke through the seal and entered, it would be useless.
This was because without the tokens that the Lan family's Great Emperor Nether Flame had personally forged back then, cultivators below the Great Emperor Realm couldn't see through the essence of this place. They would only be trapped in the nefarious environment and gain nothing.