Su Xing was stunned by what he saw.


    This was not a thousand Grandmaster Level warriors, but a thousand Heavenly King Level warriors!


    The Dragon Spirit Pill and Origin Martial Pill that Su Xing had painstakingly developed before could only increase the number of Heavenly King Level warriors in the Great Xia Country by a few hundred.


    But he hadn''t expected that the Rebirth Pill would be so effective!


    The Rebirth Pill, purely aimed at strength-type warriors, helped them to increase their strength.


    Although it came with the side effect of reduced intelligence for a few months, they could recover in no more than a year.


    The efficiency of this strength improvement was astonishing!


    If Su Xing was willing to continue refining Rebirth Pills, it wouldn''t be a problem to increase the number of Heavenly King Level warriors by a thousand each year.


    "Moreover, this is only made from the Flesh Essence of Demon Kings..."


    "If we use the Flesh Essence of a Demon Emperor... I''m afraid that by then, the Rebirth Pill will be improving the strength of Heavenly King Level warriors!"


    "At that time... with an increase in strength, Heavenly King Level warriors will have a greater chance of advancing to Martial Emperor warriors!"


    A gleam of light flashed in Su Xing''s eyes as he murmured,


    "With more Martial Emperor Level warriors... will Legendary Level warriors remain few?"


    "If we really get dozens or even hundreds of Legendary warriors... in twenty years, perhaps we''ll be able to withstand the assault of those several hundred Legendary Demon Race attackers, right?"


    Su Xing felt somewhat joyous in his heart.


    If it were truly so, even if they couldn''t stop them, they could at least delay for several years.


    That meant, every simulation would give Su Xing many more years...


    By then, Su Xing would have even more time to cultivate and explore the secrets of this world.


    [But you don''t lose heart and continue to improve the pill formula, increasing your comprehension of the Rebirth Pill through repeated attempts.]


    [That same year, you begin attempting to cultivate the escape technique Divine Skill, the Sword Control Technique.]


    [In the tenth year, after a year of effort, the side effects of the Rebirth Pill have been greatly reduced, but still not enough to be used on humans.]


    [You work hard to continue developing the improved Rebirth Pill, refining more than a dozen batches of elixirs every day.]


    [And this upgraded version of the Rebirth Pill, with the Flesh Essence of the Demon Emperor as the main ingredient, when you run out of Flesh Essence, you go to the Demon-Subduing Pass to kill Demon Emperors and gather materials.]


    [Over the course of a year, you almost killed a hundred Demon Emperors... and made over a hundred changes to the formula of the Rebirth Pill.]


    [Amidst a life devoted to alchemy, three years pass in the blink of an eye...]


    [In the thirteenth year, this is the fifth year of your research on the upgraded Rebirth Pill.]


    [Over the past five years, you have revised your studies thousands of times and finally obtained an upgraded version of the Rebirth Pill with the lowest side effects!]


    [You take three months to refine a thousand upgraded Rebirth Pills and find three hundred Heavenly King Level warriors and ten Martial Emperor Level warriors to take them.]


    [Even after several improvements, the side effects of this version of the Rebirth Pill are still not low.]


    [Because the Flesh Essence of the Demon Emperor is even more violent, the Heavenly King Level warriors who took the Rebirth Pill showed various degrees of emotional disturbance, and some even developed bipolar disorder.]


    [Fortunately, you were prepared in advance, having arranged for a psychologist in advance, and admitted this group of three hundred Heavenly King Level warriors to the hospital collectively.]


    [Three hundred Heavenly King Level warriors staying in the hospital together, seeing a psychologist, was truly a rare sight.]


    [Compared to Heavenly King Level warriors, the Martial Emperor warriors had much less severe side effects after taking the upgraded Rebirth Pill and only occasionally experienced auditory and visual hallucinations...]


    [In the fourteenth year, after a year of treatment, this batch of Heavenly Kings and Martial Emperor Level warriors fully recover and are discharged from the hospital.]


    [After your examinations, comparisons, and data analysis, the professionals who took the pill all showed rapid increases in strength.]


    [The Heavenly King Level warriors who took the upgraded Rebirth Pill experienced an average strength increase of about forty percent!]


    [Each Heavenly King Level warrior took three Rebirth Pills, which is equivalent to an increase of two to three hundred thousand catties in strength per pill!]