Strongest Demon King

once there was a powerful demon king named su ling he was feared by everyone in the three worlds because he has a secret tool for cultivation nobody ever see his tool he was alone standing in the world peak one day he was flying through a village on sword he saw children crying he has never stop child crying he say to children if you always crying you would never achieve something the children was very talented and they has a special type of body he accepted two talented orphans as his discipled he teach his discipled martial arts there was a discipled named mu xie he was slow in progress but another one was very talented mu xie learned all martial arts that his teacher taught him he has a very profound knowledge in every martial arts but he cannot find why his progress was slow he has decided to gone on a journey one day heaven elder was in contacted with mu xie in a journey elder said that he is not fit to be a demonic cultivater but he was fit to be a righteous cultivater but elder said that if he want to be a righteous cultivater and wanted to accep him his discipled he has to kill his master mu xie was jealous of his senior brother because he get master appreciation and his master always wanted him to be like his senior brother so he hates his master he and elder make a plan to kill demon emperor next month Next month heaven elder lead a army to kill demon king but no one in heaven succeed but in the end his discipline mu xie betrayed him and he escaped in three worlds and reborn in human with special type of body because this human was dying he wants to revenge on mu xie and heaven he swear to be powerful enough to finish the heaven and his discipled mu xie