Mortal-Style Cultivation: Immortality Begins as a Cannon Fodder

[Traditional fantasy + no System + decisive and ruthless + slow-burn] The winds rage across the northern frontier, and the land is in turmoil. Li Fan joins the army in a time of chaos. What? You can cultivate immortality in the barracks now? Ridiculous! What use is it for a mortal to cultivate immortality? In these chaotic times, a mere soldier like you is nothing but cannon fodder. How is your struggle any different from an ant putting on a show? When a common man is roused to fury, blood spills three feet. I have a heart that can bear witness to Heaven and Earth!