The brightly lit study was peaceful and quiet.

    Occasionally, the sound of pages turning could be heard.

    Su Nan sat behind the desk, engrossed in his reading.

    In the invisible void, every so often, a notification flashed indicating progress in learning spells.

    Su Nan had successfully mastered the 【Shield Spell】.

    Now, he was learning 【Charm Person】, with the progress bar already exceeding 90%. In two or three days, he would completely master it.

    However, after that, he wouldn’t have any more spells available to study.

    “Although I’ve commissioned the Fire Fox Commerce Association to find spell resources, finding an appropriate one-ring spell isn’t easy. I wonder how things are progressing?”

    Su Nan closed the book, muttering to himself.

    Suddenly, he sensed something and looked at the entrance of the room with a slight smile on his face.

    “Where have you run off to this time? Haven’t been causing trouble, have you?”

    “Hisss!”

    A hoarse call responded to him.

    As if lifting an invisible curtain, a giant lizard appeared out of thin air near the entrance, wagging its head at Su Nan.

    Perhaps it had been confined too long in the cage; the Hidden Dragon thoroughly enjoyed its newfound freedom, running around the inner fortress every day.

    Luckily, it possessed perfect stealth abilities, capable of camouflage and shifting between reality and illusion, preventing panic.

    No one had noticed its existence, not even Brother Ke Yi, a great knight.

    Su Nan couldn’t help but marvel at his incredible luck; the first magical pet he had contracted possessed such powerful abilities.

    In terms of physical strength alone, the Hidden Dragon was only at the level of a junior grand knight.

    But with its camouflage and reality-illusion shifting abilities, even a higher-level great knight could be killed by its stealth attacks.

    Moreover, the Hidden Dragon’s physical strength had a lot of potential for further development.

    The reason lay in its dragon-lizard bloodline.

    According to information provided by the Synthesis Cube, the dragon-lizard bloodline in the Hidden Dragon presently had a concentration of only 18.35%.

    If the concentration of its dragon-lizard bloodline could be increased, it would naturally vastly enhance the Hidden Dragon’s power.

    “Increasing the bloodline concentration…”

    Su Nan’s eyes flickered with thoughts.

    He had tried giving the Hidden Dragon dragon blood potions, but unfortunately, the effects were negligible.

    While dragon blood potions contained elements of draconic blood, they had been transformed to enhance one’s constitution. Even if the Hidden Dragon consumed them, they couldn’t elevate its bloodline concentration; at best, they could slightly strengthen its body.

    After pondering for a long time, Su Nan decided on an unconventional approach: directly replacing the Hidden Dragon’s blood.

    With the Synthesis Cube at his disposal, he could extract the dragon-lizard blood from the Hidden Dragon, synthesize it into higher-tier pseudo-dragon blood, and then inject it back into the Hidden Dragon, thereby achieving the blood replacement goal.

    Extracting blood, synthesizing advancements, and re-injecting; by repeating this process continuously, the Hidden Dragon’s bloodline could be ceaselessly enhanced!

    It’s worth trying!

    “Is this considered exploiting a glitch?”

    Su Nan chuckled to himself.

    Of course, this process would likely be rather lengthy.

    After all, the amount of synthesized blood would drastically reduce, and re-injecting it couldn’t replenish the extracted blood completely. He had to wait for the Hidden Dragon to produce new blood to recover itself.

    Thus, blood replacement could only be carried out periodically.

    As for extracting blood from the Black-scaled Lizardmen captives, even if it wasn’t a drop in the bucket, the blood incompatibility between different individuals would make the blood replacement surgery more difficult and risky enough for Su Nan to abandon this idea.

    Anyhow, the feasibility of blood replacement looked quite high, and Su Nan believed it was worth a try.

    “Fortunately, Biological Modification advanced to level 2 recently; performing a blood replacement surgery shouldn’t be difficult.”

    Under Su Nan’s rapt gaze, the Hidden Dragon lying on the ground shuddered violently, recalling the terror of being subjected to blood extraction previously.

    Deep into the night.

    A silver moon hung high in the sky, casting moonlight like a soft veil.

    In the darkness, two figures silently scaled the wall and sneaked into the courtyard.

    Looking at the quiet courtyard, the two exchanged glances, both showing a hint of confusion.

    How could it be that the residence of the city lord of Blackstone City’s brother didn’t even have a guard in sight?

    Could the guards of Blackstone City’s inner fortress be this lax?

    If the guards at the other target’s place were similar, this assassination mission would be very easy for them.

    After a brief exchange of looks, the two men in nightwear held the sword hilts at their waists and moved towards the corridor deeper in the courtyard with tacit understanding.

    According to the informant’s report, Su Nan rarely allowed his servants into the courtyard, so they didn’t know which room he usually slept in. For now, they could only search room by room.

    Fortunately, there weren’t any guards here, so they didn’t worry about taking too long and being discovered.

    Under the cover of night, their actions were very smooth, encountering no hindrance at all.

    But for some reason, they both had a thin sense of unease, their backs faintly cold, as if watched by some dangerous presence.

    Yet, looking around, there was not a single silhouette in sight.

    The two merely thought they were being overly cautious, shook their heads to suppress the strange feeling, and continued sneaking inside.

    They crossed the courtyard and reached the corridor ahead.

    Looking at the closed door deep in the corridor, both gripped their sword hilts tightly, silently drawing the longswords from their waists.

    However, just as they drew their swords, the sense of unease in their hearts suddenly magnified, and a chill surged from their spine.

    At that moment, they simultaneously felt the fear of death.

    Rich combat experience accumulated over the years made them act without hesitation, decisively lunging to the sides.

    Yet, the man on the right had only leapt three or four meters when his body froze mid-air, with several arched blood holes suddenly bursting from his chest, twisting his head and feet at a strange and unnatural angle.

    The other assassin stabilized his body upon landing, and seeing this scene, his pupils instantly contracted to pinpoints.

    Under the blood mist sprayed by the moonlight, a gigantic beast with a length of over ten meters, covered in scales, stood on all fours, casting its form faintly in the night.

    Its mouth, filled with sharp teeth, tightly clamped down on his comrade, with blood flowing down from the shivering body.

    Clearly, his comrade was beyond saving.

    “By the Star God, what kind of monster is this?!”

    The man gasped in shock.

    He had seen ferocious beasts before, but a creature as long as this, capable of invisibility and eluding even two knights, was unheard of!

    Plop!

    The monster spat out the body, hissing, as its massive form slowly disappeared into the moonlight.

    The man’s scalp tingled as he turned and fled, in the blink of an eye reaching the courtyard wall, leaping to vault over it.

    But the next second, he felt as if struck by a rapidly flying boulder, hearing the crack of bones breaking, screaming as he was thrown ten meters away before crashing to the ground.

    Even after the heavy blow, the man was unwilling to give up, spitting out mouthfuls of blood and struggling to stand and escape, but then felt something press on his back.

    The next second, excruciating pain overwhelmed him, drowning his consciousness.