A month has passed since Leonard, now known as Benimaru, travelled in the One Piece world, and he still feels weird. Still, he is not complaining, as Wolf and Benimaru managed to complete the design of the future submarine of the Heart Pirates with additional artillery.
Benimaru designed a cannon that would fire 100 times stronger than the regular canons in the One Piece world, it would use a large explosion in a compressed space where the canon ball were waiting for the momentum that the explosion would have, giving it a push, but Benimaru wanted to complete it as he calculated that if this would be the main weapon of their ship, it's gonna break the moment it was fired the first time.
Benimaru also started desigining an engine that would use sea water as a fuel, where it was connected through multiple tubes that would supply it the sea water as it moved forward, and in the engine, there is a part that would automatically convert the seawater into hydrogen to use as a fuel, don't ask how it was going to work but Benimaru thought that maybe if he managed to see other kinds of ships, possibly the Arx Maxim that Enel created, he would be able to recreate it and the Pluton but that would be in the future when he decided to adventure for himself.
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In terms of training, Benimaru haven't relaxed, as even though he was training the four who were much weaker than him, he was also creating his fighting style that would integrate all of his advantages, like the Diamble of Sanji or Red Rock of Luffy, as he kept thinking back towards the Night Guy of Might Guy where his chakra created a Dragon
to attack Madara, he wants to recreate it using his flames and possibly haki in the future.
Benimaru also managed to learn everything that Law was teaching, with him experimenting on some things to create a recovery pills, similar to the chinese cultuvation bullshit that he read from the past.
The pill works as it would increase the recovery rate of someone who would drink it, as the pill would rapidly increase the metabolism of the user, making them absorb the nutrients faster.
He was also now experimenting on how to recreate the serum that Saturn injected to him, as he wants to integrate the characteristics of animals towards the four he was training, as he wanted to make it as if they are Zoan users without having to eat Devil Fruit kinda like how minks were born, but so far, he doesn't have any direction on how to start.
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The four were now able to run the 100 laps of climbing the mountain in about 3 hours as their body was being strengthed by the training of Benimaru, while eatinga lot of nutrients to supplement their growth, and now, they were in sparring against Benimaru, who despite all of their growth, still can't be touched.
"Alright, that's enough, now, considering that all of your body adjusted to the training, let's up the intensity, as starting tomorrow, you would have to carry a weight that would depend on your strength while running, for Law, you would lift 1 ton stone, while Bepo, would lift 2 ton of stone and both Shachi and Penguin would lift half a ton each," Benimaru stated, as he felt that this was the appropriate weights for the 4, with Bepo having the strongest physical strength of the four due to his race, and Law following due to him having the Will of D., he also managed to advance the use of his Devil Fruit, but not yet at the level on the future.
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After ending their sparring session, Benimaru explored more part of the forest as he doesn't have anything to do and wanted to see the beauty of the forest and the sunset that he watched on the top of the mountain in Swallow Island, while walking, a landslide occur in the mountain, revealing an entrance to a secret cave that he did not noticed before.
Benimaru goes inside as he was curious to see what it was, it was then that he saw a large underground system where the cave would lead into multiple turns, Benimaru felt excited, as he thought that maybe there are hidden treasures here as he would certainly hid his treasure in this kind of cool system.
After a lot of walking where Benimaru had to speed walk the entire cave system, he arrived at another entrance where there was a door that was made completely out of metal, The door looked heavy as it looked like made from a mixture of metal and seastone. Benimaru then lifted the gate, where he used all of his powers just to lift it over his head.
'How heavy is this thing that it made me struggle like that?' Benimaru thought while carefully placing the door down as he did. ot want the ground to crack.
He used his fire to illuminate the entire room and what he saw surprised him, as it looked like a lab, where there are a lot of books stacked in the bookshelves, collecting dusts, but there has so many coppies of books, it nearly reached more than 10,000 books in numbers, there's also chambers that were empty and old computers.
Benimaru just explored the entire room until he came across a diary, which he read, and it was a log that was based on research, and Benimaru decided to read it from the very first page.
[Day 1: The entire research team started the study on genetic enhancement where we would rewrite a DNA to mimic an animal and human hybrid, the research is called the Project: Mink, named after the species that were rumored to have been living in the giant elephants back, we hope to create a serum that would simplify the entire process, End.]
[Day 2: Still conducting the same study, we found that the apes have genetic similarities with humans as they matched 98.8%, which would be our first lead to unlocking our goal. End]
[Day 10: The serum was completed, it was a mixture between a human and a mandrill, as they have the perfect mixture of strength and speed. End]
[Day 11: The test subject that were injected by the serum have began to exhibit increase strength and speed, equal to 10 times the original strength of the test subject but we also noticed it's apparent lack of intelligence similar to the mandrills that we took the genetic information from, but aside from that, we felt that we are treading towards the right direction. End]
'So this was a lab based on the previous experiments that I wanted to do, it seems a little convenient as I just started working towards that goal, but who am I to complain,' Benimaru thought. At the same time, he continued reading the diary and the books available in the laboratory.