After swallowing the Bone Demon Ancestor, the swamp spread toward Lone Mountain City.
The two layers of Defensive Formations around Lone Mountain City were utterly unable to withstand the black swamp.
In mere moments, the entire Lone Mountain City was swept into the black swamp and vanished without a trace.
The many traces left on the ground were completely devoured by the swamp as well.
After devouring Lone Mountain City, the swamp rapidly shrank, ultimately becoming a black sphere the size of a fist.
Wang Daoyuan called out, "Fellow Daoist, we need to leave quickly. That old Heavenly Demon will catch up soon."
The Calamity-Conquering Formation Immortal hurriedly tore open space, and the two entered a spatial world to flee for their lives.
Before entering the spatial world, Wang Daoyuan had specifically cleared away the traces of aura left behind by himself and the Calamity-Conquering Formation Immortal.
Before long, the two fled to the shore of the Storm Sea.
Tearing open space within the Storm Sea might allow the storms to invade the spatial world, destroying the entire space and causing endless trouble.
The two could only force their way through countless storms once more and return to the small island where they had hidden before.
Upon reaching the underground cave sheltered from the wind, the Calamity-Conquering Formation Immortal let out a long breath.
"Since the Devil Race invaded the Immortal Realm more than four hundred thousand years ago, this is the first time a Devil Ancestor has fallen."
Wang Daoyuan was somewhat surprised. "Something has always puzzled me. The Immortal Realm should have no fewer experts than the Devil Race.
"The Immortal Realm has lost quite a few of its nine peak Dao True Immortals, so why have none of the Devil Race's Nine Great Devil Ancestors died?
"Even