Timeless Assassin

[Using the mana balls as a power core, charge up all the 121,776 micro-mana pathways leading to your bone marrow, to begin the production of new blood cells.]

Leo exhaled sharply, his eyes scanning the glowing text before it shifted into an anatomical diagram.

The complexity of what he had to do this time around was simply staggering— the diagram wanted him to activate hundreds of thousands of micro-pathways at once, which looked like a tree branch diverging into uncountable roots.

However, instead of a trunk, all of them stemmed from the two mana balls he had painstakingly guided to his femur bones.

It required a level of fine control that he had not yet mastered as a warrior, however, he had no other choice but to give it a shot regardless.

Closing his eyes, he focused on the mana spheres embedded deep in his legs and upon his command, they pulsed faintly, like miniature hearts awaiting further instructions.

Carefully, he tried to push the energy stored within them outward, attempting to distribute the stored mana through the delicate channels branching into his femur.

However, just as he started that process, he felt a sharp jolt of resistance surging through his body.

Apparently, the mana flow stuttered, clogging at multiple junctures, as it found itself unable to disperse properly.

It was like trying to force a flood through thin, fragile pipes, and his small mana circuits could clearly not handle that much load.

[Mana flow error detected. Improper distribution rate. Restarting process.]

The glowing text flashed red, and Leo clenched his jaw, suppressing a frustrated growl.

He wasn’t lacking the focus—it was just that his pathways weren’t accustomed to this level of fine control, forcing him to be more careful.

’Alright, I can do this if I am incredibly patient, I just need to be patient–’ Leo thought, as steadying his breathing, he tried again.

This time, he adjusted his approach, visualizing the mana not as a torrent but as a steady trickle, slowly seeping through the microscopic channels.

He adopted a patient approach, waiting for mana to move forward on its own instead of forcing it to circulate, as he only applied the lightest of pressure.

"Oh yeah…. That’s the way to go—" Leo muttered out loud in joy, as very soon he realized that this approach was indeed the right one, as the mana began reaching the marrow production site within the femur bones.

[Micro-mana pathways successfully charged. Initiating bone marrow activation.]

A deep warmth spread through his femur, unlike anything he had ever felt before as the mana he sent in began to react with it.

It wasn’t pain, but it was something entirely foreign, as his body could sense something changing on a cellular level.

[Red Blood Cell production in femur bone marrow successfully altered.]

[New Blood Cells are now being generated in place of standard Red Blood Cells.]

His eyes flicked open as more text appeared, displaying a comparative diagram of standard human red blood cells versus the new ones forming within him.

Normal red blood cells were small, disc-shaped, and functioned solely as oxygen carriers.

But in contrast, the new blood cells were twice as large, capable of storing and transporting mana while also carrying twice as much oxygen to provide a completely superior alternative to the old cells.

"Holy shit… so this is what all this was about!" Leo realized, as he finally understood why this meditation manual not only improved the user’s mana capacity but also altered their body constitution.

It was an amazing technique, but before Leo could celebrate the production of the new blood cells, another red alert message cut his excitement short.

[Warning: Mana power core depleting. Estimated time remaining: 50 seconds.]

The warmth in his femur bones flickered, the energy draining rapidly.

His body was consuming the mana supply at an astonishing rate, fueling the transformation at an unsustainable pace prompting the meditation manual to instruct him to find a replacement immediately.

Leo gritted his teeth, already forming a new mana ball in his left palm, but his body resisted.

His circuits were strained, his focus already taxed from the precision required in the last step.

And hence, it became nearly impossible for him to circulate an entirely new batch of mana, while also maintaining the on-going process without any mistakes.

Unfortunately, this meant that in 50 seconds, his power core ran out completely, pausing the production of new blood cells, as the text before him updated yet again.

[Mana depleted. Restart required.]

"Shit." Leo exhaled sharply.

He had failed to get the next mana ball down in time, putting an end to the new cell production.

Leo understood that ideally, he should have had the next batch of mana cores ready before the previous ones depleted, but doing so required an immense level of mental precision and discipline.

And right now, he simply wasn’t fast enough.

For the next several minutes, he worked meticulously to repeat the process. He condensed another mana ball in his palm, ensuring its density was sufficient before guiding it back down the precise pathway he had memorized.

However, despite his best efforts he made a few minor mistakes whole guiding it down, and was forced to retrace his steps a couple times before achieving the desired result.

Overall, nine grueling minutes passed before he finally succeeded in splitting the energy into two and positioning them correctly in his femur bones again.

But by then, all the previous progress had already halted and the window of efficiency was completely lost.

Panting, he wiped the sweat from his brow, and restarted the process of trickling mana to his femur bones, which once again restarted the production process of new blood cells.

However, once again it was depleted within the minute, and Leo had to start from zero yet again.

"Fuck this is hard–" he realized, as just as he was about to restart the process, doing it all over again from step 0, the text before him shifted again, showing him an analysis chart.

[Optimal Replacement Efficiency Data:

Maintaining continuous flow for 2 hours/day → Peak production rate: 100,000 new blood cells/day.

If sustained for over 2 years → Full blood replacement achieved.

Breaks or inconsistent training = Efficiency drop, extending the process indefinitely.

If sustained for 5 hours/day → Full replacement may be achieved within 8-9 months. ]

Leo’s head tilted slightly as he read through the numbers.

The process wasn’t just difficult—it was a battle against time.

If he failed to maintain a constant cycle, the replacement process would take years to complete, making it a terrible waste of time. Your journey continues with NovelBin.Côm

The first thing he needed to do to practice this method efficiently was to learn how to maintain a constant power cycle, as without it, doing the same steps over and over again with delays in between was next to useless.

The Complete Marrow Meditation Manual aimed to reconstruct his body, one cell at a time, and to do so, the replacement rate of new cells produced had to out-weigh the death+ production rate of old cells.

If achieved successfully, the new blood cells didn’t just enhance mana storage; they increased oxygen efficiency, improved muscle endurance, reduced lactic acid buildup, and optimized cardiovascular health.

Which meant that if he completed the transformation, he wouldn’t just be a stronger fighter.

He’d be something far beyond human limitations.

But getting there was the real challenge.

Right now, he was too slow. It had taken him nine minutes to restart the process, and if he kept going at this pace, the replacement cycle would take forever to complete.

This meant that not only did he have to get faster, he also needed to get more efficient and more precise, as only then could he hope to master this technique and complete the replacement rate within a reasonable timeframe.