Martial Arts: Adopted by the Demonic Cult Leader as an Adopted Son

On a dark and stormy night, a girl from the future found her ancestors with her newly developed martial arts system, implanted the system into the ancestors' minds, and then disappeared. This sudden change could not change his frail body, so he was adopted as an adopted son by the uniquely intelligent leader of the Demon Cult, competing with his eldest sons for the position of leader. Let's see him become the master of this world, standing in the sky and proud of the world; let's see him destroy all the enemies along the way and become the leader of the world's number one religion. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.