I Became an Immortal by Eating Soft Food in a Strange World

Traveling through the world of high martial arts, I became an old man who was about to die. In order to survive, I married a female corpse in red from the back mountain. She helped me sweep the floor and cook, and she also helped me kill enemies instantly. But every night when we share the same bed, I am afraid that she will turn me into the same kind of person. Until that day, when ten immortal sects besieged my home, she floated out and all the ghosts surrendered. Only then did I realize that my wife seems to be the ancestor of the evil god that they have worshiped for thousands of years.