Under the dark sky, white snowflakes fell on the ship, causing a thick layer of snow to accumulate on the deck.

After having dinner and spending some leisure time, Sephiroth discovered something unusual in the world of One Piece...

This world seems a bit boring! If you don't have a mobile phone or a computer, forget it. Who would've thought of traveling to another world?

The most embarrassing thing is that on this ship, there isn't even a book to pass the time...!?

Alright! He admitted that he subconsciously ignored a fact...

Although the technological level of the One Piece world has experienced an explosive leap in growth due to the intervention of the moon people.

But…

In order to erase the historical traces of the huge kingdom, the world government abandoned many things, and lunar technology was one of them.

For this reason, they set the development progress of the entire world back to the medieval era!

As a result, most countries in the world still implement feudal monarchy or even slavery...

Human rights? Freedom? Equality?

In the eyes of the ruling class, this kind of thing is undoubtedly crooked and vicious remarks...

It's no wonder that the revolutionary army formed by Dragon is a thorn in the World Government's side!

'This world is hopeless; I want to go back,' Sephiroth groaned feebly in his heart.

At Hancock's suggestion, the four came to the deck and played a game of building a snowman...

Sephiroth knelt down, picked up a handful of snow on the deck with his hands wearing cotton gloves, and placed them on the slightly rudimentary snowman, but the expression on his face was a little absent-minded.

Hancock put a felt hat on the snowman she built and used a carrot and two potatoes to serve as the nose and eyes. Then she nodded with satisfaction.

"Sephiroth, what are you thinking about? Why are you so absentminded?"

After seeing the crooked snowman built by the silver-haired boy, the girl with long black hair couldn't help but burst into laughter.

"What exactly is haki? How can I learn and use this power?"

When Hancock heard this, she immediately understood.

This afternoon, Sephiroth suddenly awakened his conqueror's haki, which saved the four of them from being killed.

It is only natural that he would like to know how to use this powerful ability.

Thinking of this, Hancock crossed her shoulders with her arms and a thoughtful expression appeared on her face. She slowly explained to the confused boy:

"According to Captain Shakky, Haki can be divided into three types, Conqueror's Haki, Armament Haki, and Observation Haki."

"Conqueror's Haki is a one-in-a-million, innate qualification, and those who have this qualification are not 100% able to awaken it, so no one has summarized a specific training method."

"However, the other two types of haki are very universal and can be learned through training as long as one has the talent and perseverance to awaken it."

"Therefore, Armament Haki and Observation Haki have been researched and explored by predecessors and we have a rough way to train them."

"Armament Haki is a kind of energy inherent in every creature and hidden in their body."

"Users of Armament Haki can cover their bodies with it to form a layer of transparent armor."

"While greatly improving defense, it also allows the user to touch the entity of a Logia Devil Fruit user."

"In addition, there are more advanced ways to use Armament Haki…"

"On Amazon Lily, since all the citizens are women, in order to maximize their combat capability, there is a widely circulated method of wrapping armament haki around weapons to enhance their damage."

"And ummm… It is said that there are very few very powerful people on the sea who can also wrap their conqueror's haki with their attacks, thus accurately stunning the enemy from a distance... I don't know if Captain Shakky was telling the truth or not…"

"As for the ability of observation haki, it can be said to be a kind of 'hearing power.' As long as a person is alive, their body will produce special sounds. After hearing these sounds, one can predict their opponent's next move and position. So, as long as one exercises this ability, the range can get bigger.

"However, according to Captain Shakky, this is just a low-level use of observation haki. As long as the enemy's attack speed is close to the speed of sound or exceeds your own reaction speed, it will become useless."

"It is said that advanced observation haki can even briefly predict the future, but it relies more on a person's sixth sense, so this is also a skill that requires a certain amount of talent to learn."

"Although this kind of talent is not as rare as conqueror's haki, it is still very rare."

The expression on Sephiroth's face hesitated for a moment, and then he tentatively asked:

"Hancock, can you teach me how to practice Haki like in Amazon Lily?"

Somewhat to his surprise, the girl with straight long black hair agreed very quickly:

"Sure! No problem!"

As if to comfort the young man and ask him not to be too burdened, the girl added two more sentences:

"Actually...this training method is already considered a semi-public technique on the Grand Line."

"However, our Amazon Lily method is a bit more detailed."

"Then how to get started?" the silver-haired boy asked.

"What about this...? Let me give you a demonstration!" Hancock started teaching.

"You have to look carefully, I don't have a lot of armament haki, and I'm not very skilled in using it..."

As she spoke, Hancock lowered her body and formed a snowball on the deck with her hands.

Immediately afterward, the girl with long black hair clenched her teeth as if she was holding her breath or exerting strength all over her body.

After a few seconds, a hint of gray-black aura appeared on the white snowball.

"Ha!"

Hancock shouted and threw the snowball in her hand violently, hitting the snowman she had built before.

There was a 'bang' sound of an explosion, and the snowman was instantly blown away by the snowball.

"Haah…"

Hancock breathed a long sigh of relief, and the act of condensing armament haki around the snowball was not an easy task for her now.

Due to excessive consumption of haki, her body even felt weak.

"See that light black gas?"

"That is the effect produced by wrapping armament haki around an object."

"Certainly! If the amount of armament haki wrapped around an object is too small, there will be no change in color…"

"It is said that some powerful swordsmen can even use their armament haki to temper their swords into extremely strong black swords..." Hancock explained.

"Uh-huh! Teacher Hancock, please continue the explanation. I will definitely keep it in mind...!"

Sephiroth nodded repeatedly, with a curious look on his face.

"Armament Haki is actually a kind of energy produced by human muscle cells."

"One can feel its presence through rhythmic breathing and meditation."

"Once you can clearly feel the existence of this energy, you just need to try and mobilize it during body movement..."

"Huh!?"

Sephiroth listened to the words spoken by the black-haired girl, and he was inexplicably reminded of the concept of "Qi" in Chinese novels...

"What's wrong?" Hancock asked after noticing his distraction.

"It's nothing; please continue!" Sephiroth snapped out of his daze and tried to change the subject.

"Oh! Well, since everyone's talent for armament haki is high or low, so the difficulty for sensing and using it is different…"

"If you can't feel the presence of Armament Haki through breathing and meditation…"

"Then, you need to undergo long-term extreme physical exercise, and only after your physical fitness improves to a certain level can you sense it and gradually learn how to use it..."

From Hancock's explanation, Sephiroth knew that there were people who could use and practice armament haki whether in the second half of the Grand Line, the first half, or all over the world.

Even many famous pirates may have their unique way of training observation and armament haki…

After all, haki is the power hidden in the human body. Even those who are not physically strong have a chance to awaken as long as they master the correct guidance method.

Let alone Charlotte Lingling who was born with awakened armament haki; there are many people like Ace who have inexplicably awakened their armament haki.

On Amazon Lily, there are many people who have awakened their haki through practice. After they awaken both armament and observation haki, they have a chance to board the pirate ship and sail around the world with other female warriors who have also awakened two types of haki.

But…

People who don't know the existence of haki will not necessarily lose a fight against haki users. If their skill, ability, or physical fitness is good enough, then it's easy to beat a weak haki user.

After all, in simple terms, haki is equivalent to buff in a video game. It can enhance your strength, but having a buff doesn't necessarily mean that you can defeat enemies who can crush you in terms of basic hard power.

Therefore, in conclusion, haki users may not necessarily be strong, but the strong ones at the top of the world will definitely be haki users.

Sephiroth estimates, 17 years later when Luffy goes to the sea, there were very few pirates who knew about haki in the first half of the Grand Line, but in the second half, even elite soldiers of the marines were haki users.

A more reasonable explanation should be that haki users among pirates in the first half of the Grand Line must have gone to the New World willingly or were exterminated by the marines or hiding deliberately.

After all, long before Roger started the golden age of pirates, pirates were still sailing around aimlessly in the Grand Line. After Roger's death, pirates started searching for the big secret treasure of the seas and competing for the position of the Pirate King.

Most of these powerful pirates headed towards the New World, whereas only losers like Trebol, Vergo, and the rest of the Donquixote cadres fled to the North Sea. When Doflamingo was a child, they only chose to follow him after the other had awakened his conqueror's haki.

This shows that even in the Four Seas, there are hidden people who know the existence of haki. But their number may be relatively small…