Having acquired new ninjutsu, Charles's first move was to experience it in the practice field.
His consciousness materialized into the training ground, where he looked at the row of targets dozens of meters away.
"Summoning Jutsu!"
In the next second, a gigantic Fuuma Shuriken appeared behind Charles. Upon obtaining the Ninjutsu: Come and Go Shuriken technique, he also gained proficiency in tool summoning.
Tool summoning didn't require as much trouble as animal summoning. A simple hand seal was enough.
"Ninjutsu: Come and Go Shuriken Technique!"
Charles exerted all his strength to throw the massive Fuuma Shuriken in his hand. With a loud whoosh, the Fuuma Shuriken spun and flew out.
"Swish! Swish! Swish!"
With Charles's own strength backing it up, the Fuuma Shuriken moved at a lightning-fast speed, packed with kinetic energy.
It directly pierced through the practice field's target, then shattered the surrounding wall and flew into the distance. Everywhere it passed, whether it was a wall or a huge tree, it was cut off.
Finally, it returned with the same force, only stopping when it reached Charles.
Charles caught the returning Fuuma Shuriken and nodded in satisfaction at the destructive power it had caused. This skill seemed pretty good at the moment.
Charles tested the direction of the Fuuma Shuriken again, and as expected, it could be controlled very easily. It could strike wherever he wanted, without worrying that the opponent would dodge in advance based on the trajectory.
After a few attempts with the Come and Go Shuriken ninjutsu, Charles began to experiment with the newly acquired Earth Release: Earthquake.
Charles quickly formed hand seals and slammed the ground, shouting loudly, "Earth Release: Earthquake Technique!"
In the next instant, the ground in front of Charles shattered, and countless rocks and earth shot up, causing the enemy to float.
Since it was the first time using this ninjutsu, Charles didn't control the output of his own chakra but instead followed the system's recommendation for the release.
Therefore, the area of damage caused was not very large, only about ten square meters.
After getting a feel for the release technique of this ninjutsu, Charles started controlling the chakra output of the skill.
The first time he released the ninjutsu, the chakra output was too huge, resulting in the failure of the ninjutsu release.
This made Charles realize that the newly acquired earth attribute chakra was not as familiar to use as the previous fire and lightning attributes.
With each attempt, Charles paid attention to the chakra attribute conversion and the chakra output, and finally, after several attempts, Charles found a point where the ninjutsu was not disrupted and the chakra output was at its maximum.
"Earth Release: Earthquake Technique!"
Charles clapped his hands on the ground, and a large amount of chakra was released. The entire ground of the practice field trembled instantly, and the next second, the ground directly cracked and lifted.
As the ninjutsu was released, the practice field's ground was directly destroyed. Charles discovered that he could not only control the ground lifting but also its sinking.
This made Charles feel that this ninjutsu was very similar to the Earth Release: Earth-Style Wall and its advanced version in Naruto.
In the world of Naruto, this ninjutsu was mainly used for assistance, such as digging trenches. However, under the cheat code of the mobile game, this purely supportive skill had gained some offensive capabilities.
At this moment, it wasn't just Charles who was practicing. Other summoned ninjas also had the hand seals and releases of these two ninjutsu in their minds.
However, they were not like Charles, able to increase their earth attribute chakra. They needed to develop it themselves.
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While Charles was practicing new ninjutsu, Tony Stark was conducting his experiments in the underground laboratory.
"On the 11th day, the 37th trial."
Tony looked at the intelligent robot next to him and said, "Because I have no choice, you are still working as a part-time firefighter. If you dare to spray me again and I'm not on fire, I'll donate you to the city university."
Then Tony looked over at Peter, who was lying down, and said, "Peter, if I'm in any danger, remember to catch me in time, just like before."
Peter raised his head, looked at Tony, whose legs and arms were equipped with mechanical skeletons, and said, "Yes, Mr. Stark."
After confirming everything, Tony spoke to J.A.R.V.I.S., "Alright, this time it should be smooth. Let's start with just one percent of the total thrust."
"Prepare, 3, 2, 1."
With Tony's words, there was a charging sound, and in the next moment, flames immediately jetted out from Tony's feet and palms for propulsion.
In an instant, Tony rose into the air. After maintaining his stability, he tried for a few seconds before stopping.
"Peter, did you see that? Fantastic!"
Peter, who had been lying down, immediately stood up and looked at Tony, who had just floated, with amazement.
Flying abilities were extremely rare in the ninja world. Even though some ninjas were powerful, moving mountains and breaking rocks was nothing, but true flight was something very few could achieve.
In Peter's eyes, ninjas with the ability to fly were truly scarce.
"Mr. Stark, your research abilities are really great!" After landing, Tony, upon hearing Peter's praise, proudly said, "I, Tony, am the super genius in this world."
Just as he finished speaking, the robot aimed the fire extinguisher at Tony again.
Upon hearing the commotion nearby, Tony immediately turned to the robot and said, "Stop aiming that thing at me as if I'm going to catch fire at any moment."
"Relax, if I really catch fire, then aim it at me."
"Alright, now adjust the thrust to twenty-five percent."
"3, 2, 1."
This time, the thrust from Tony was even stronger, and more flames spewed out from his limbs, even sparking a lot of sparks.
With Tony's slight movements, his position immediately changed, flying towards the parked car beside him.
"Shit, I didn't mean to come here."
The flames from Tony's feet jetted over the top of the car.
Tony lamented, "My car, my car, my car."
Upon hearing Tony's exclamation, Peter stepped forward and kicked one of the wheels of the still undamaged red sports car, moving it to another position.
"Thank you, Peter!"
After some adjustments, Tony finally managed to control his flight direction and immediately returned to the testing center, coming to a stop.
At the same time, he said, "I can finally fly!"
After the flight test, Tony began manufacturing other armor components.
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