Li Tian only smiled when he noticed the black stones. He didn't clear them away or disrupt their formation.
He knew that the fifth elder's spiritual power was attached to the stone, and once he moved it, he would alert the enemy.
As for the function of the black stone, it was nothing more than to detect the formation or to destroy the formation in the Duke's mansion.
Li Tian sensed that most of the arrays in the mansion had been affected to a certain extent. They were either weakened or had problems operating.
However, the Heaven's End formation was undamaged. Perhaps the fifth elder of the Wei family was too weak to detect the existence of the Heaven's End formation, or the quality of the black stone was too low to affect the Grandmaster level formation.
