Lin Huang would have loved to prolong the fight with the Black Serpent but since the Double Reward Card effective time was only an hour, he could not stay any longer. He needed to complete ten kills within an hour, which was six minutes on average to kill each monster. Therefore, he had to kill the Black Serpent immediately.
By teasing the Black Serpent, he managed to distract it while the three fiends cooperated to attack it. First, it was the Malachian Fiend who locked the Black Serpent's attack and the Witch that used Witchcraft to seal its mouth temporarily while the Inferior Imp was simply a distraction. The real ultimate move was Lin Huang's Star Dome sword skill. After integrating many sword skills, the Star Dome was no longer comparable to legendary-level skills. The more sword skills were integrated, the stronger the sword skill was. Although the Star Dome was far from being mythical-level, it was much stronger than most legendary-level sword skills.