Jacob's expression was ashen when he read about this ability because it was more like a suicidal ability than helpful.
"How would I know it has activated or not?" Jacob asked quickly because he suddenly felt like something was extremely wrong.
"Hahahaha… didn't I tell you it's your heartbeat? It's the key to Fluid Acceleration. If you want to activate it, your heartbeat rate should be around 10 heartbeats per second (BPS).
"Let's call 1X Acceleration. However, it's where your real problem lies because once you enter 1X acceleration, you'll have to learn how to keep it that way. Because it would only increase, not decrease.
"Right now, your current heart can handle 3X Acceleration or 4X for a few seconds. As for your body, it would explode at 2X because it is still not balanced with your heart's progress yet.
"Not only do you have to learn how to maintain the exact acceleration speed and control it, but you have to learn how to reduce it as well because once it started, it won't reduce on its own.
"You're not like those bugs that can only use fluid acceleration on others and didn't care about stopping it afterward, nor they can. But your plight is you can start it on yourself and have to learn how to stop it!"
Jacob smiled wryly when he read this. He had to admit this ability was as useful as it was dangerous.
Because with this fluid acceleration, he can make his blood circulation at an extremely high right, and blood circulation fueled the human body.
If Jacob can accelerate it at will. Not only will it increase his sensory reactions, and physical performance, it can help to heal his wounds faster, it can make his brain sharper and his senses extremely high, and it can help him digest nutrition at an alarming rate.
However, this was also a double-edged sword, just as Immortika disclosed. If he accelerates his blood circulation over his heart and body limit, he would really explode.
But this wasn't the only danger. He would burn his body energy extremely fast, which means he is required to keep a high energy source ready all the time.
But first, he had to learn how to decrease and increase his heart rate like breathing, but he was afraid to activate it and then not be able to handle it.
While he can't just let it as it is as well because if he didn't learn how to control his heart rate, he might accidentally activate it when he experiences some perilous situation, and he knew he will.
This world wasn't peaceful, and he also required strength to achieve immortality, so it was only a pipe dream if he thought he can achieve it without experiencing any dangerous situations.
"I guess you don't have any excellent suggestions to master this fluid acceleration, do you?" Jacob inquired with narrowed eyes.
Although he still resents Immortika, he knew when it comes to knowledge; it was the only thing he could count on.
"Hehe, I can't answer that." Immortika playfully rejected.
Jacob pulled a long face, but he knew the information about the fluid acceleration was the only thing he would get from Immortika. So, he didn't waste his breath on persuading it, since it was meaningless.
"But… you'll find it on your own. I have faith… hahaha…"
Jacob's eyes shimmered when he read this subtle line. But before he could mull over it, he suddenly heard footsteps outside the cave entrance.
He only noticed that his hearing had become even stronger than before. Although those footsteps weren't exactly outside the cave, they were closing in, and quickly at that.
'Are they coming for me or simply passerby?' Jacob mused.
"What are the tiers of those people?" Jacob quickly asked Immortika with a hint of anticipation and killing intent.
The Dark City was only a couple of miles away from this area. If they're some rare species, he didn't mind killing them. He direly needed nutrition right now, as his hunger was nowhere near sustainable.
Since those guys delivered themselves, he didn't mind eating them and collecting more hearts and blood in the process.
"Oh… hahahahaha… you won't believe it. There's three of them you even know between these prey, and one of them is even your old acquainted…"
When Jacob read the entire writing, he was astonished before a murderous glint flashed past his rancor eyes.
'So, that's how it is, huh? I never thought they'll send someone after me, and I even failed to notice it. But to think it that motherfucker again. Well, since they're courting death, I don't mind harvesting some high-quality meat and collecting some debt in the process as well.' Jacob's lips rose into an icy smile.
If they came before the absorption of the mutant's heart, he might've decided to run, but now he was confident in handling them. They simply prey for him right now, not enemies.
Although Jacob looks skinny right now, he was laden with power, and as long as he didn't go overboard, his body would not break, and his heart rate will remain under the 1X acceleration limit.
He quickly donned his clothes and mask before he sat down on the corner and wait for the prey's arrival.
Thereupon, Jacob heard the voice of the boulder moving as his lips curled. 'He's probably stronger than the mutant. Well, this also means he can probably make my body 50% adaptable with my current heart if I ate him.' He licked his lips like a hungry wolf.
"Mr. Jack, how about you grace us with your presence?" A sarcastic voice rang in the cave without any hint of urgency.
Jacob finally stood up and walked unhurriedly with both hands in his pocket.
At the mouth of the cavern, Jacob saw three figures: one was two-meter-tall and burly, while the other two were half of its size. One of them was even wearing a cape.
Jacob sounded surprised and fearful. "You're quite far from home, Boss Jerry and Mr. Observer, and… your friend, I guess."
Yes, the two of them were indeed Jerry and Mr. Observer from Jerry Pawnshop.
Jacob didn't know they would put a tail on him just because of titan iron bricks, and they probably came here after learning he had more and to make sure he won't escape.
Jacob had to admit, Jerry was extremely strong, while the capped person also gave off a powerful feeling. He was probably an A grade while Mr. Observer was as strong as that Hob Troll of Killer Skull Society.
This lineup was enough to destroy the entire uncommon region, and they're here just for uncommon titan iron?
Jacob was now even more interested in why they wanted this titan iron so badly to even leave the protection of Dark City and came all the way here to retrieve it.
Jerry smiled coldly as he said, "Mr. Jack, you deserved this treatment. Since we're done with the pleasantries, how about we talk business?"
"What kind of business, if I may ask?" Jacob's voice was filled with trepidation.
"Nothing much, we just want to buy the titan iron you have and also want to know your source. In return, we'll let you… live." Jerry pulled a sinister smile at this moment while he excluded a powerful killing intent.
Although they were told Jacob had buried some bags in the wildness, they weren't sure if they were filled with titan iron. But just the chance was enough to make Jerry leave his turtle shell.
He was extremely confident in taking care of Jacob before returning, and with his allies, there was nothing that could go wrong.
Even if Jacob had an A rank strength, he can't do anything but submit. As for letting him live, it was the question of whether they needed Jacob alive or not after they learned about his titan iron source.
Jerry even prepared a high-level parasite gem to enslave Jacob if they deemed him valuable.
"In exchange for my life, I'll naturally tell you everything. But can you at least tell me why you're so interested in uncommon titan iron?" Jacob asked sheepishly.
Jerry was even more at ease when he sensed Jacob's fear and merely chuckled, "Heh, if I tell you, I have to kill you. But since just made it apparent that you do possess a titan iron source, I'll tell you a little. You see, the titan iron can be turned into a special elixir that can help us grow stronger without any consequences. It is the extent of information I can give you."
Jacob's eyes dilated when he heard this.
"Alright, now that you know, I required you to place this gem on your forehead. Who knows? I might even let you enjoy the elixir if you serve me well." Jerry suddenly tossed a small black pouch toward Jacob and gave an absolute demand.
Jacob caught the small pouch when he opened it.
It was a parasite gem, but it was slightly different from the parasite gem Decker used on him!