One Piece System
THE SAME OLD TRICK

When Ken hit his grandfather with the blunt side of Stormbreaker, he could see that Grandpa's hand had gone black. The hammer blow could not advance no matter how much power Ken exerted.

"Damn! The lightning did nothing. Even the clothes are fine."

"What a good grandson. It seems you have hidden quite a lot. Tell me what fruit do you eat?" ask GARP.

"Did I look like someone from the Grand Line who was shouting his own Devil fruit from the start?" Ken took a few steps back as he combined Mjolnir and Stormbreaker to send a lightning strike at Garp.

Luffy on the other hand was having fun defeating the marines. After the first marines fall, the others take Luffy seriously as they pull out a weapon to take Luffy down, but he's too fast. Luffy only used his cane, his taijutsu and did not even bother to use his rubber fruit to fight these people.

Using rubber fruit will be excessive!!

After the massive lightning strike, there was dust and wind around Garp. Ken knew that this lightning bolt would do nothing and he was ready to make his next move. Luffy is almost done with his fight and has knocked down several marines. These Marines are also in semi-holiday mode as Garp himself has just come for a vacation and these guys are not coming with all their gear either.

After being struck by lightning, GARP appeared out of nowhere near Ken who was waiting for a reaction. GARP had appeared on Ken's blind side so he couldn't see Garp who had used his hand to land a punch towards Ken.

But the premeditated punch did not land on Ken as he dodged and jumped back. Garp's turn was shocked. GARP has used one of six Marine styles. Shave off. It was like teleportation. And GARP is pretty sure that he's fast enough. But he still misses. After a moment of surprise, there was another smile on his face.

"Haha.. Didn't know you learned Haki yourself. You surprised me more Ken."

"Who came to surprise you? Luffy, are you done?" Ken yelling. The answer he got was Luffy appearing near Ken with a jutsu of his body wink.

"Ready?" Luffy yells.

"Let's go." Ken jumps towards Garp as the two of them now use their respective weapons to attack Garp from both sides. Ken uses frontal attacks because he is basically a tank while Luffy as a ninja uses past knowledge to hit Garp from the blind side.

And thus the epic battle begins 1v3.

Luffy attempted to attack GARP and even landed a few punches and Enma onto GARP's body while Ken used his Mjolnir and Stormbreaker. GARP seems to be having fun. And this really pisses Luffy off.

"Earth's style: The Great Mud River."

And this single made the people who were hiding away amazed and even Garp was also because this one move made the land where Garp stood turn into a huge river of mud and drowned Garp until he was his knee. This sudden attack was not what Garp expected. He actually felt from his Haki that something unprecedented was going to happen, but because he was not looking into the future, he could not say what it was and his entanglement with the lightning-infused Ken attack did not allow him to rest. .

After the river of mud drowned Garp, Luffy did not stop as he made a hand gesture and used another jutsu to make sure Garp would fall to the ground and then Ken could do the trick.

"Earth style: Dragon mud bomb."

This move threw a mud bomb at Garp at high speed. The bomb hit Garp like a small cannon and this attack ensured that Garp would fall in the river of mud that Luffy had just made. In fact, after doing this Luffy instead used Enma to hit Garp on his chest by lengthening his stick.

This is the opportunity that Ken has been waiting for. He picked up his Mjolnir and headed straight for Garp and without giving him any time or space to escape, he placed Mjolnir right on his chest. The mud river instantly disappeared like it had never appeared before and Garp was lying on the ground with a hammer over his chest.

GARP saw this start laughing. He was completely shocked by the movements Luffy made. He had seen many people doing many moves in his life, but this was the first time he had seen someone making a river of mud out of nothing and even making it vanish. This was new to Garp and it got him excited.

"Not bad kids ... Not bad. But this isn't enough. I am proud of how strong you two are. Now it's time to come up with .... Uh!!" After the initial laughter and happiness, GARP's smile slowly disappeared as he realized that he could not get up from the ground. No, he can't even move from the ground.

Ken and Luffy who were standing in front of Garp smiled when they saw this. This was a trick that Ken had been eager to try since the beginning. He knew that GARP would underestimate him and not use his full Haki. Being the grandfather of the two, he would hold back and this was a gamble that the two of them wanted to play.

And it paid off. Ken could put a hammer on Garp's chest and now no matter what, he would never be able to get away with this. No matter how strong someone is! No matter who he is. Only decent ones were able to lift the hammer and GARP was definitely not one of them.

"Grandfather, we're sorry but we have to do this" Ken said.

"What kind of hammer is this, why can't I lift it?"

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Hello everyone, I really want if you can give some power stones to the story for a more honorable rank. Thank you