The pirates sat and forgot, and they really believed the nine truths and one lie.

By closing his senses and blocking out the noise from the outside world, Luffy felt his body and mind reach an unprecedented level of comfort, even better than the feeling Nika gave him.

A memory from not long ago gradually emerged in his mind. Luffy was wearing weighted clothes to exercise, and when Mr. Wu Tian was looking for food for him, he told him why martial artists were so powerful!

"Luffy, do you know why I asked you to practice your Ki all the time?"

Luffy shook his head while gnawing on the pieces of sea king meat, which were roasted to medium rare by Mr. Muten, and they tasted a bit of blood.

"When the martial arts energy is refined and purified to a certain degree, the whole body can be strengthened." Teacher Wu Tian has more than once belittled the outside world's armed color domineering, and in his opinion, only pursuing strength and defense is putting the cart before the horse.

If one day Luffy trains his body to be strong enough, theoretically he can generate and hold more Qi, and Luffy's body will undergo a qualitative change.

Luffy is still a very elastic rubber man, and his ability to carry martial arts energy far exceeds that of ordinary martial artists. Even Master Wu Tian is very envious of this.

Luffy's rubber body is very suitable for the path of martial arts. When pirates fight and kill outside, it is only temporary after all. Teacher Goten hopes that Luffy will have higher pursuits.

"Luffy, I believe you will be able to use it one day, so I will teach you a move temporarily. The name of the move is Kaio-ken!"

Luffy thought the name Kaio-ken was strange. Who is Kaio? Why not the Fist of Martial Arts?

The prerequisite for using King-ken Kaio is that Luffy must have a large amount of available Qi in his body. The stronger the Qi is, the more convenient it will be to use King-ken Kaio.

On a whim, Teacher Muten demonstrated to Luffy how to use the Kaio-ken. The Straw Hat Kid was amazed at the teacher's strength, but he had basically forgotten it all when he woke up the next day.

For this, Master Wu Tian punched Luffy several times. At that time, he thought it was too early for Luffy to consider Kaio-ken. He should wait until his apprentice mastered the Flying Dance Technique before thinking about other things.

If Luffy could use King-ken, his strength could be doubled, but the price would be a heavy burden on his body in a short period of time. Even Master Takenori did not dare to stay in the King-ken state for a long time.

After all, the human body has a carrying limit. One must exercise hard every day to break through the limit in order to allow the body to store more energy.

Teacher Wu Tian speculated that with Luffy's physical tolerance, his apprentice would be able to bear more load using Kaio-ken and could fight with Kaio-ken for a long time.

At that time, Master Roshi actually didn't know that Luffy was not a user of the superhuman rubber fruit ability, but actually had an even more amazing physique, the animal-type mythical beast-human-human fruit - Nika, whose pressure-bearing capacity was more than a hundred times that of ordinary fruits.

The Kaio-ken has extremely huge side effects and can burst out geometric multiples of combat power in a short period of time. It is simply a special move tailor-made for Nika!

"Thank you, teacher. It turns out I remembered this. I didn't expect it would come in handy today..."

Luffy gradually opened his eyes, and his closed senses gradually recovered, "Grandpa... you are the first target I must defeat. No one can stop me from saving Ace"!

Astonishing changes followed one after another, and a visible white energy field began to emerge from Luffy's body. It was no longer ordinary Haki, but a more primitive and pure Qi.

White air currents surrounded him, forming a translucent air curtain, with arc-like energy occasionally surging on the surface.

"This aura... is still growing!" Joz was shocked to find that the gravel under his feet began to tremble slightly. He was pressed under the steel and was the first to feel the changes in the ground.

As Luffy's energy continued to accumulate, an invisible pressure began to envelope the entire Marineford.

The pressure did not come from murderous intent or hostility, but from a pure energy pressure, like the low pressure before a storm, making it difficult to breathe.

"What a joke...", cold sweat seeped out of Yamato's forehead, "This level of aura is beyond common sense, is this still the domineering aura that I know?"

Luffy, high in the sky, was completely wrapped in a huge air mass, and only his outline sitting cross-legged could be vaguely seen.

The air mass continued to expand, its diameter expanding from a few meters to more than ten meters, and then to dozens of meters. The expansion of the air mass suddenly accelerated, and a shock wave visible to the naked eye exploded in all directions with Luffy as the center.

That was not an attack, but just a natural leakage of overflowing energy, but it had already caused a huge change in the sky above Marinford.

"This is just... leaked breath." Marco transformed into a phoenix and flew back to the battlefield, protecting his companion Luo behind him, his eyes full of shock.

After the impact, even stronger pressure descended. Everyone in Marinford felt like a diver diving into the deep sea, bearing tremendous pressure from all directions.

The weak soldiers could no longer stand and collapsed to the ground. The stronger officers could only kneel on one knee, barely supporting themselves, trying to compete with Nika's unleashing of his domineering color.

"Monster..." Lieutenant General Ghost Spider gritted his teeth, and he could no longer lift his sword.

The air masses in the sky began to change shape, sometimes contracting, sometimes expanding, as if a huge heart was beating, and with each beat, the pressure increased.

"He is pushing his limits," Whitebeard watched everything from a distant ship, with a gleam of relief in his eyes. How great it would be if Luffy could be his son.

Edward Newgate and Garp will definitely have their own arguments. He can't let the navy heroes take advantage of him. Luffy calls Whitebeard "Dad" and Garp "Grandpa".

In the center of the air mass, Luffy's expression remained calm, but the energy in his body had reached a critical point.

His consciousness was no longer confined to his body, but was connected to the life force of the entire Marinford.

He felt the emotions of everyone below him—fearful, determined, evil, kind…

"Enough..." Luffy whispered to himself, but his voice miraculously spread throughout the battlefield.

The air mass began to shrink, all the energy gathered inward, and most of it was completely retracted into Luffy's body.

He kept his white afro raised, and his whole body was covered in a white airflow visible to the naked eye. The physical strength given by Nika really helped him a lot!

Nika Luffy stood up and looked down at Marineford below, his signature, liberated smile appearing on his face again.

"Hehehe..." Laughter rang out, and Nika's drum beats sounded again, but this time, the drumbeats were infused with a deeper power.

Luffy jumped lightly and fell from the clouds. There were no fancy moves, no angry roars, just a simple free fall.

But as he fell, the air was trembling and the space was distorting. "Grandpa, I'm not afraid of you this time..."

Luffy said with a smile, his voice was lighthearted and cheerful, but it sent chills down the spines of everyone who heard it. The drumbeat of Nika's heart had never been so powerful.