Welcome to My Secret Immortal Life

Frank Lundy's wife sent him up the mountain believing she was tricking him into taking on a disaster meant for her. What was up there was an old recluse who took him on and taught him for five years. He comes back a cultivator, and nobody who knew him as a useless husband recognises what he now is. A disciple of a war god comes at him and Frank puts a sachet of laxative in his food, which ends the fight in public and badly. A woman is sent to kill him and he turns the plan back on the people who hired her. Then his wife's family arrives to break off the marriage, bringing along the elder they all bow to, from the sect they consider untouchable. Frank knows him. On the mountain that elder carried his chamber pot.