Yang Yan squinted his eyes slightly. With the aid of the slanting sunlight, he discovered that the entire stone wall was reflective, except this part, which was like a black hole, swallowing all the light.
However, because this area was very small relative to such a large stone wall, it was easily overlooked if not carefully observed.
He hesitated slightly, then directly approached this somewhat peculiar small hole and attempted to inject spiritual power into it.
Indeed, there was something unusual.
But all it did was to devour his spiritual power, with no other response.
Yang Yan furrowed his brows, feeling he might have missed something, and began to search the area carefully again.
With the earlier discovery, it was relatively easier for him to search with a specific purpose now.
He soon discovered the second hole.
Then the third, and fourth...
In the end, he found a total of forty-nine identical holes on the stone wall.
