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With a genuine vampire available for experimentation—and an effectively unlimited supply of vampire-derived materials—Black Super's experiments became increasingly bold.
However, he didn't experiment directly on the subject. Instead, he worked with blood samples and tissue samples.
Rather than worrying about ethics, Black Super was more concerned about accidentally introducing a substance that might instantly wipe out the vampire test subject.
If it turned to ash on the spot, would he have to ask Blade to go capture another one?
Wasting vampire lives was trivial—wasting time was not. What could be solved in one night might take several more just to secure another test subject. Why bother?
His super brain lived up to its name. Before long, Black Super identified the effective components within garlic extract. It wasn't a single compound, but rather a specific ratio of mixed substances.
Soon, he formulated the first batch of the mixture, followed by several variants with slightly adjusted ratios. Which formula worked best would have to be determined experimentally.
Since the compound functioned as a reducing agent targeting red blood cells, human trials weren't necessary—blood samples alone were sufficient.
Black Super tested both the captured vampire's blood and Blade's blood, wanting to compare a full vampire with Blade, who called himself a half-vampire.
The results showed that the reducing agent worked identically on both samples. Different ratios affected speed, duration, and strength of the effect, but the overall response was the same.
In other words, the reducing agent Black Super created could not only suppress Blade's bloodthirst, but could also be used by true vampires.
He recorded the characteristics of each ratio, highlighting several with particularly useful properties.
For example, one formulation acted slowly but lasted longer—suitable as a long-acting suppressor.
Another worked rapidly but wore off quickly—ideal as a temporary combat stimulant.
He added these as notes, leaving the choice of which version to use up to Blade. Black Super had no intention of interfering.
He also tested the reducing agent on tissue cells, using only vampire samples this time—he had no intention of experimenting on Blade.
The results, however, were less promising.
The selected mixture worked well on red blood cells, which lack nuclei. But the infected, dual-nucleus cells caused by the vampire virus showed resistance. The agent couldn't even kill those infected cells.
Despite that, the result actually suited Black Super just fine. He only intended to delay bloodthirst—not cure vampirism or revert vampires back into humans.
With the reducing agent essentially complete, his work on synthesizing erythropoietin (EPO) was also nearing completion.
Removing the EPO from the lab shaker, Black Super injected it into a slide containing red bone marrow samples and observed the changes under a microscope.
Perhaps due to being outside the human body, red blood cell production did occur—but at a much slower rate than in a normal, stable human system.
Further examination of vampire samples revealed that their hypoxia-inducible factors differed from those of humans.
This had already entered the realm of molecular biology. Without cutting-edge medical research and willing vampire subjects, such differences would be nearly impossible to detect.
Still, progress had been made in red blood cell production. Continuing down the path of studying hypoxia-inducible factors would drift into longevity and immortality research—far beyond his current goals. So he set that aside.
Standing before the test tube of erythropoietin, Black Super tapped his fingers lightly against the table.
His options were clear:
Extract bone marrow from the only full human present—Abraham Whistler—for in vitro testing.
Or extract it from Blade.
Or skip straight to human trials… and test it on a vampire.
While Black Super weighed the pros and cons, Abraham Whistler had already finished reading the notes Black Super left on the reducing agent formulas.
Though he hadn't assisted in the research, he had observed the entire process. When he understood something, he watched; when he didn't, he asked.
Eventually, the research became too advanced—even with explanations, he couldn't follow. So he stopped asking, and Black Super focused entirely on his work.
Still, Whistler could understand the results.
The notes on the reducing agent gave him some ideas. He tried not to interrupt Black Super's thinking… though that restraint lasted about three minutes.
Since Black Super's face was hidden behind a mask, Whistler couldn't tell if he was thinking or dozing off. Finally, he spoke:
"So, this stuff you made—is it a success or a failure? Why are you standing there thinking so long?"
Blade, who had been reading the notes behind Whistler, also looked up.
Black Super answered frankly:
"This is a hormone that stimulates bone marrow to produce red blood cells. The results I just got weren't very significant. I'm not sure if it's because the experiment was conducted outside the body, or because I used vampire bone marrow."
"So what are you deciding now?"
"Whether to extract your human bone marrow for testing, or go straight to in vivo testing on that guy. As for Blade's bone marrow… I don't think it'll produce much difference."
Whistler didn't refuse outright. Instead, he asked:
"Does that guy still have any use?" He pointed at the unlucky vampire strapped to the workbench, paralyzed from a cervical spine injury.
Black Super thought for a moment and replied seriously:
"I've already collected all the data I need. All required experiments and samples are complete. He has no further use to me—you can decide what to do with him."
Whistler didn't hesitate. Pointing at the vampire, he said:
"Then stop wasting time. Test it on him. Whether it works or not, we'll know in one go.
"At worst, he burns to ash and the drug fails. But you came up with two drugs in less than a night—are you sure this thing actually works?"
Black Super replied:
"Because the solution itself isn't something that needs to be invented from scratch. Others just never thought to apply it to vampires. I only needed to synthesize it and determine the dosage."
That was true for erythropoietin—but not for the reducing agent. That part was more of a conceptual shortcut disguised as something else.
Still, Whistler's reluctance to undergo bone marrow extraction was understandable. The procedure carried risks.
Even with local anesthesia, it was painful. And if performed poorly, it could cause serious damage.
Since Whistler had made the call, Black Super didn't dwell on it further. He prepared to inject the vampire test subject.
Drawing a large dose of erythropoietin into a syringe, Black Super paused just before administering it.
Blade and Whistler, both anticipating the result, looked puzzled.
"What's wrong?" Blade asked.
"You'd better get your weapons ready," Black Super said. "If the effect is too strong and he breaks free, you'll need to put him down immediately. We can't have him escaping and spreading word of what happened here."
"That likely?" Whistler asked, surprised.
"Just in case."
It was sound advice. Neither of them objected.
Whistler grabbed a shotgun loaded with silver rounds, while Blade returned to his room and retrieved his titanium alloy sword plated with silver.
The two vampire hunters took positions on either side of the workbench.
Standing at the vampire's waist, Black Super injected the large dose of erythropoietin directly into the lumbar spine.
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