Gabriel was able to easily kill such an initial Boundless Realm talent, number 20 on the expert board not only because he was strong, but because the celestial artifact was strong too.
He didn't destroy the few corpses; he just allowed them to stay there.
Gabriel stabbed the celestial artifact into the ground in front of him. He held the handle and just quietly guarded the place.
He closed his eyes and used his senses to scan the surrounding area. He guarded the land 100 miles around.
Gabriel wanted this place to be watertight. No one could think about getting past him.
In these 100 miles, the other places were harder to traverse but there were still others who used short cuts. They crossed the complicated landscape so as not to bump into the Heaven Mountain people.
Gabriel sensed that a person was speeding through the cliffs like an ape. He crossed several mountains and was about to pass Gabriel's region.