Learning Haki

Boom!

When both Garp and Rey's fist collied, it created a small shockwave and some of the soldiers watching the battle took some steps back to steady themselves.

Garp was astounded by Rey's strength which is completely different from what he imagined or experienced months back.

'This brat... how is he improving so fast! Moreover, his strength will be even greater than when he emits the white aura from his body.' Garp thought.

Garp was like a mountain to Rey, even though he only used half his strength, Garp was able to easily counter his fist.

Once again Rey charged at Garp and punched him with his full strength which even he doesn't know how powerful it is.

Garp could sense the tremendous power hidden within the fist which is completely different from the previous strike.

"What?" Garp was shocked, he soon faced the attack with his own fist but no one knows whether he used his full physical strength or not.

But the collision was so powerful that the surrounding soldiers are flung away by the impact caused.

Rey took a few steps back to brace from the shock while Garp stood like a mountain. Even so, Rey could roughly guess Garp's physical strength which is at least threefold higher than him.

If he opens his fouth gate, then his physical strength may very well reach Garp's level.

"Good!" Garp praised, which is something rare.

"What a terrifying kid, I think he will reach my level within a few years" Vice Admiral Doberman who was also watching the fight expressed.

"I don't think he needs years to surpass you" Vice Admiral Momonga who was beside spoke.

Even though Doberman could see Rey's strength, he believes Rey needs some years to surpass as he is very well versed in combat skills and using Haki which Rey doesn't even know.

Hearing Momonga's words, he expressed his displeasure on his face but said nothing.

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Garp's office,

"What do you know about Haki since you were always asking me to teach you?" Garp asked.

"Haki is a mysterious power present in everyone and also only by using Haki we can hurt certain devil fruit users like Logia," Rey replied.

"Looks like you understand much more about Haki than I thought," Garp said, amazed by Rey's Knowledge.

"Haki is nothing but a spiritual power or life force in one's body. Your Haki will become stronger if your spirit is strong and unyielding."

"However, most people do not notice it and fail to awaken it. There are two types of Haki everyone could use, given the proper training, but there is a third type that only a certain people possess which can't be practiced or learned. Only the chosen ones use that."

"First, Kenbunshoku or Observation Haki is an ability to sense and predict spiritual energy or life force others."

"Second, Busoshoku or Armament Haki is an ability that allows one to use their spirit to create an invisible armor around yourself which provides one a potentially incredible offensive and defensive capabilities. Only using this form of Haki, you can injure Devil Fruit users that are immune to certain kinds of physical harm, mainly Logia users."

"Third, Haoshoku or Conqueror's Haki is a rare form of Haki that cannot be attained through training. Only one in several million people have this ability; This type of Haki allows one to exert their willpower over others. They have the qualities of a King"

Garp explained everything about Haki not knowing Rey already knows everything about Haki.

"If you want to learn Haki, you should be prepared since it's not easy to learn and my training in Haki will be different from others," Garp said with an evil grin.

A bad prenomination rose in Rey's heart but he steeled himself so that he can learn Haki. He knows Garp is one of the strongest Haki users in the One Piece world so if he learn it from him, he will be able to improve faster.

"Kid, If you have any unfinished business finish it today, from tomorrow onwards your Haki training will officially start," Garp said.

"Ok," Rey nodded his head and left the office. He also informed Mia that he is going to start training on Haki and urged her, that she also should learn it. Mia agreed and reached her instructor Vice-Admiral Tsuru to learn.

From the next day, Rey's training in Haki began.

Morning,

Rey came to the training field and waited for Garp. Garp arrived after a few minutes, presented him with a black cloth and ordered Rey to tie his eyes with it.

As soon as Rey tied the black cloth, a fist punched him in the face and knocked into the ground.

Since Rey was blindfolded, he wasn't able to see anything and what welcomed him is nothing but complete darkness.

"Ah! Old man, why did you hit me?" Rey cried, knowing it's was done by Garp.

"Bwahaha, I wanted to make sure your vision is completely blocked."

"You could have simply asked me..." but what greeted him is another punch to his face.

"What are you doing?" Rey cried again.

"Brat, don't you want to learn Haki? I am teaching you right now." Garp said and begin to attack Rey without giving any chance for Rey to speak.

The following days become nothing but hell to Rey as he was tormented by Garp and he was also not allowed to remove the black cloth even in normal times.

At first, Rey wasn't even able to walk properly but as time passed he got adapted and began to use his ears to sense the surroundings.

Every day, Garp will request some of the soldiers who are off duty and let them attack Rey; it was simply torturing him to bring out his spirit power.

From morning to afternoon, Garp will teach him about Bushoshoku or Armament Haki and in the latter half, he will teach him about Observation Haki.

Days passed, it took 20 days for Rey to just sense others using his Haki while one month to coat his arms using Haki.

What's surprising is, Rey found out that he can combine his Haki with the pure energy inside his body. It's just a little challenging for Rey to control his pure energy and utilize it with Haki as he needs perfect control over his pure energy.