Obviously, it was an impossible situation, and Zhou Tian's attack was actually continuously effective. Although the Dark Attack Zhou Tian launched seemed incapable of harming the Ancient Powerful Being, every time the Treasure blocked Zhou Tian's attacks, its energy was also subtly diminishing at a rate perceptible to Zhou Tian.
Given the circumstances, although the Dark Attack appeared to be restrained by the Treasure, the Treasure itself consumed more energy in resisting the darkness. Thus, although Zhou Tian was unaware of the Treasure's weakness, using the power of darkness, though troublesome, could still be considered his trump card for breaking the deadlock.
Because of the situation at that time, despite his attacks having limited effect, Zhou Tian could persist continuously.
Zhou Tian persisted because he saw hope, and to be honest, if he continued like this, there's a possibility that he could completely drain all the energy within the Treasure.
