[Just as I encountered a Demon Emperor charging atop the city wall.]


    [Without hesitation, Origin Force enveloped my Ink Ice Sword, and then I slashed out!]


    [This stroke cut the Demon Emperor in two. I collected the Flesh Essence of the Demon Emperor and began to examine the injuries of the surrounding soldiers.]


    [To my surprise, among the soldiers who''d been ambushed, there was my good brother Yu Yan!]


    [After more than a decade, Yu Yan had not only survived in Demon-Subduing Pass but had even broken through to the level of a Heavenly King!]


    Seeing this, the corners of Su Xing''s mouth slightly curved upward.


    "Indeed, Fatty Yu is not so easy to die!"


    "He''s still alive in Demon-Subduing Pass after ten years, that puts my mind at ease..."


    Su Xing reflected with a sigh.


    It had been over a month since their graduation.


    Yu Yan had also successfully joined the forces at Demon-Subduing Pass, fighting for the Great Xia Military.


    During this time, Su Xing occasionally contacted Yu Yan. After the trials of the battlefield, Su Xing clearly felt that Yu Yan had become much more composed.


    Previously, Su Xing had also sponsored the soldiers at Demon-Subduing Pass through Jin Congxue, in the name of the Jin Merchant Guild.


    Among them, he gave Yu Yan several purple epic-class pieces of equipment.


    Yu Yan was one of his few friends, and naturally, Su Xing did not want to see him get into trouble.


    Therefore, he helped whenever he could, and these pieces of purple equipment significantly enhanced Yu Yan''s ability to survive.


    "Speaking of which... by this time next year, my little sister should be graduating too, right?"


    Su Xing sighed, having spent the past year busy with simulations and increasing his strength; he hadn''t even gone home for the holidays.


    [According to my research, when ordinary Human Race professionals consumed Flesh Essence of the Demon Emperor, they could hardly digest the energy within, so their strength only increased slightly.]


    [Therefore, I attempted to research turning the Flesh Essence into Elixirs, hoping to enhance the strength of the Human Race in this manner.]


    [In the twelfth year, I studied the medicinal properties of Flesh Essence during my spare time, while maintaining my daily cultivation.]


    [According to Li Fire Alchemy, there was an Elixir called Rebirth Pill, which was only of low grade.]


    [Its effect could compensate for the innate deficiencies of Qi Refinement practitioners. Even those with weak physical constitutions could greatly improve their physique after consuming several Rebirth Pills, almost comparable to the early stages of Body Refinement Cultivators.]


    [And the main ingredient was the flesh of some precious Spirit Pets, as it contained the essence of life.]


    [According to my idea, if the main ingredient was slightly modified, the effect of Demonic Beast Flesh Essence might be even better.]


    [So I continued my cultivation while attempting to refine new Elixirs.]


    [In the twelfth year, I made a minor breakthrough in my cultivation of Protective Gang Qi, nearing the Mahayana Level.]


    [That same year, my research on Rebirth Pills also progressed further. Initially, I used Demon King Flesh Essence as the main ingredient, and while the effect was outstanding, the potency was too wild, with significant side effects.]


    [I didn''t use humans for the experiment, only capturing some monsters from the simulations to test.]


    [I observed that some monsters increased in strength after consuming the pill, but some burst open and died.]


    [I wasn''t satisfied with the outcome, so I tried improving the pill''s formula in my spare time away from daily training.]


    [In the thirteenth year, my Divine Skill of Protective Gang Qi was getting closer and closer to Mahayana Level.]


    [At the same time, after many revisions, the side effects and instability of the Rebirth Pill had been greatly reduced, but it was still not safe enough to be used on professionals.]


    [Amidst the arduous cultivation and countless revisions to the Elixir over two years, time steadily passed.]


    [In the fifteenth year, on a sunny and peaceful afternoon, my years of hard work paid off, and my Divine Skill Protective Gang Qi finally entered the Mahayana Level!]


    [Simultaneously, my mastery of Origin Force grew closer to perfection, approaching the third stage''s completion.]


    [That same year, I finally refined the Rebirth Pill - its potency was so strong that it could even compare to a mid-grade Elixir!]