My Disciples Went Dark After the Sect Was Besieged

Su Changchun is sentenced to death by the emperor for harboring imperial remnants. If he refuses, the imperial forces will attack and destroy his sect in seven days! However, Su Changchun activates a dark system! His disciple Li Qianqiu witnesses him taking a spirit-locking pill and successfully goes dark, gaining a hundredfold cultivation speed and an invincible talent. His sect, angered by his incompetence, is attacked, successfully going dark and gaining self-defense abilities. Even his dog goes dark, obtaining the Black Emperor's true form and divine weapons. When the imperial decree arrives, the royal court's ascendant experts descend upon Xuanming Sect with a million soldiers. Su Changchun sits calmly before the mountain gate...