The Seventy-Year-Old Master of Survival in a Fantasy World: I Stack Iron Shirt Skills Through My Kids

(Fantasy with an unconventional premise + a seventy-year-old man from the start + master of survival + power-up progression + play the pig to eat the tiger + the Myriad Worlds + one heroine, with multiple incarnations) Xiao Fan is a frail old man of seventy, nearing the end of his life. His lifespan is nearly exhausted, and he's been gravely injured by the shockwaves of a battle between cultivators, left waiting to die. For generations, the Xiao family has had no spiritual roots. Their bloodline is universally considered good-for-nothing, with no chance of attaining immortality. He and his seven children have spent their lives practicing the Iron Shirt, a basic external martial art that has taken a toll on their bodies. After a lifetime of mediocrity, he is about to be buried in the wilderness when, at death's door, he awakens the Descendants-Stacking System! I'm no good at writing introductions, so please head straight to the story.