Lin En widened his eyes.


    Without a word.


    He quickly opened the counter and took out a high-quality enhancement potion meticulously researched by his teacher from the cabinet.


    "Try this one, I guarantee you''ll be satisfied this time."


    Lin En said seriously.


    [Top-tier Berserk Potion]: Significantly boosts all-around abilities and puts the target into a berserk state.


    He placed the blood-red potion bottle on the table.


    Without a doubt.


    This potion was definitely the best-kept secret of their Blood Saw Apothecary!


    The Black Knight reached out, grabbed the potion, and drank it in one gulp.


    Instantly.


    A red glow flashed across his body, and a faint blood-red hue appeared in his eyes, clearly indicating the potion was taking effect.


    [Ding! Crisis Level 20%]


    "Minimal effect."


    The Black Knight casually tossed the potion bottle aside and rasped:


    "This kind of potion might work on weaker creatures, but for me, it''s negligible."


    "…"


    Lin En widened his eyes and quickly took out another high-quality potion from under the counter, saying:


    "Then try this one!"


    "Trash!"


    [Crisis Level 30%]


    ...


    "What about this?!"


    "For hemorrhoids."


    [Crisis Level 40%]


    ...


    "This one is definitely the best!"


    "Expired!"


    [Crisis Level 60%]The narrative has been stolen; if detected on Amazon, report the infringement.


    "…"


    A few minutes later, Lin En solemnly looked at the array of empty bottles on the counter and then at the Black Knight, who was clearly growing impatient.


    It was evident that for a Black Knight of this level, the potions sold by their apothecary couldn''t meet his demands at all.


    [Crisis Level 91%]


    Lin En''s heart was growing anxious.


    This seemingly simple task.


    In reality, its danger level was no less than the previous ones he had undertaken.


    "It seems your shop can''t offer anything better."


    The Black Knight raised his head, cracked his neck, and rasped:


    "You''re wasting my time."


    [Ding! Crisis Level 95%]


    "Wait a moment!"


    Seeing the crisis level about to explode, Lin En reached out, adjusted his monocle, and calmly said:


    "Our shop has another potion that I believe will definitely meet your requirements, but I don''t have it in stock. I need to brew it on the spot! If you can wait a bit, I assure you it''s the best potion!"


    The Black Knight rasped, "Oh?"


    Lin En calmly said, "If you''re still not satisfied with this potion, you can cut me down on the spot!"


    [Ding! Crisis Level decreased by 5%]


    A hint of interest flickered in the Black Knight''s glowing eyes, and he said lightly:


    "Is that so? Fine, I''ll give you half an hour to brew it. Just as you said, if you can''t satisfy me, I''ll cut you down."


    "Alright!" Lin En said seriously.


    ...


    Lin En quickly rushed to the backyard.


    Without a word.


    He directly took out the recipe rewarded by the system for curing that Root-Level Monster.


    [Critical Hit Potion]


    [Quality]: Special


    [Ingredients]: Root-Level Creature Tissue x1, Explosive Fruit Pulp x1, Hell Clover x4, Black Bat Wings x1, etc.


    [Description]: A potion that significantly increases critical hit rate but also brings some negligible strange side effects...


    The reward for curing the Root-Level Monster.


    This was definitely the best potion he could offer.


    "I can only treat a dead horse as if it were alive. The system''s rewarded potion recipe should definitely be better than other potions in this world!"


    Lin En''s expression was serious.


    He quickly rushed into the warehouse, gathering the various materials needed for the potion.


    Most of the materials were already stocked in his teacher''s warehouse.


    And he also had the hardest-to-obtain Root-Level Creature Tissue.


    Last night, while fixing the teeth of that headhunter, he had acquired a large amount of tooth fragments and the monster''s oral mucus.


    He kept all of it.


    Absolutely top-notch materials.


    After preparing the materials, Lin En quickly rushed to the alchemy room in the backyard.


    Ready to start brewing!


    His alchemy level wasn''t very high, but after two years of learning from his teacher, his skills had greatly improved.


    "Start brewing!"


    [Ding! You ground the medicinal powder, Alchemy Experience +1]


    [Ding! You extracted Explosive Fruit Pulp, Alchemy Experience +1]


    [Ding! You purified Slime Mucus, Alchemy Experience +1]


    Gurgle gurgle—


    In front of the large cauldron, Lin En stirred the bubbling, creepy liquid with a stick.


    The flames roared.


    Lin En wore a mask, his expression serious.


    "First, add the Black Bat Wings, then the fangs of the Human-faced Wolf Spider."


    [Ding! You added potion ingredients, Alchemy Experience +1]


    [Ding! You added potion ingredients, Alchemy Experience +1]


    Boom—


    The large cauldron of potion instantly turned from white to purple, bubbling out skulls one after another.


    Lin En stood indifferently in front of the cauldron, continuously stirring.


    The potion in the cauldron kept changing colors among red, blue, black, and purple.


    Time flew by.


    Quickly.


    Twenty minutes passed in a flash.


    [Ding! You brewed Critical Hit Potion x1, Alchemy Experience +10]


    [Ding! You brewed Critical Hit Potion x1, Alchemy Experience +10]


    [Ding! You brewed Critical Hit Potion x1, Alchemy Experience +10]


    Accompanied by the system prompts.


    Lin En swiftly poured the potion into empty bottles, placing them quickly on the table.


    A total of ten Critical Hit Potions!


    Instantly earning him an additional 100 points of Alchemy Experience.


    [Critical Hit Potion]: For humanoid creatures only, increases target''s critical hit rate by 100%, but has some minor side effects...


    "Whether I can pass this hurdle depends on the effect of this potion!"


    Lin En''s expression was serious.


    ...


    In the hall.


    Lin En carefully pushed the black-red Critical Hit Potion in front of the Black Knight.


    He adjusted his monocle and said seriously:


    "Critical Hit Potion, the latest high-quality potion from our shop. You are the first customer for this potion, and its effectiveness is up to you to decide!"


    The Black Knight glanced at the unassuming potion.


    He played with it in his hand and said lightly:


    "Are you sure this is the best potion you have here? Think carefully, if this potion still doesn''t meet my standards, I''ll follow through on our agreement and cut you down."


    Lin En calmly said, "I guarantee your satisfaction!"


    But in truth, Lin En''s heart was pounding.


    After all, he wasn''t entirely sure about the potion''s effectiveness.


    But at this point.


    He could only trust the system''s quality!


    Pop—


    The Black Knight opened the wooden stopper on the potion bottle.


    Immediately, a faint, pungent smell wafted out, and upon smelling it, the Black Knight was momentarily stunned.


    The stench! Clearly, the scent wasn''t pleasant.


    But surprisingly, just by smelling the potion, he felt a significant reaction in the power surging within his body.


    For someone who had been using potions for years.


    This feeling hadn''t occurred in a long time.


    He became serious.


    He picked up the potion, opened his mouth, and drank it in one gulp.


    Buzz—


    Almost instantly, he felt an incredibly bitter hot stream rushing into his body.


    "This... this power!"


    He trembled as he looked at his arms and stood up abruptly.