"The Rumble-Rumble Fruit, besides basic elementalization, has four very special faculties."
"They are electric heat, electric field, radio wave, and electrotherapy."
"Electric heat is the thermal energy within lightning. Mastering it cuts stamina drain and maximizes power."
"You can use electric heat to melt any metal. The golden orbs on Skypiea were melted that way by the previous Rumble-Rumble user."
"Not only that. Once electric heat is developed to a certain level, your lightning can defend as well as attack, for example by forming a screen of light that cancels physical strikes. Anyone who touches it is shocked and burned together."
"Electric field is a unique magnetic domain only the Rumble-Rumble user can create."
"With this domain, paired with radio wave, you can turn into lightning and move at lightning speed within the field, ignoring all obstacles."
"You can also use lightning to strike targets at extreme range anywhere inside the field."
"Radio wave works with the electric field. It not only helps expand your domain to the limit, it lets you spread sensing far beyond even where the field fully covers."
"Anyone moving within your radio coverage can have their voices overheard."
"On top of that, you can sense and cut off every signal inside the area."
"As long as it's within your domain, ordinary Transponder Snails or special ones will all fail at once."
"As for electrotherapy, it is a special healing use."
"If you are on the verge of death and your heart may stop, you can shock it to keep it beating."
"That is only the simplest use."
"As long as you control current precisely, then after you and Carina finish training, you can stimulate your cells with electricity. It relieves fatigue and speeds digestion so you can eat more and absorb more."
"If you push electrotherapy to the extreme, you can even try stimulating the brain to sharpen memory."
"…"
Out on the vast sea, the sloop cut slowly forward.
On deck, Yami was helping Nami develop her Rumble-Rumble abilities.
Through Yami's explanation, Nami quickly grasped the four foundational aspects within lightning.
Then a scene like this unfolded on deck.
Nami became blue-white lightning and flashed to different places again and again.
One second at the bow, the next at the rail, then the crow's nest on the mast, then the roof of the cabin.
Her speed and the dazzling effects far surpassed Yami's Shave.
In truth, Nami was appearing in more than those few spots. She ignored all obstacles and popped into the rooms inside the cabin as well, like the lounge, her own quarters, even Yami's.
Since none of the three had Observation Haki, they couldn't sense it at all.
When Nami flickered back before Yami, she was holding two gold ornaments.
Bzzzt bzzzt…
Blue-white current wrapped the two ornaments.
With the crackle of crossing arcs, the gold softened into liquid and flowed into a folding three-section staff.
"Heehee… my weapon is back."
Smiling, Nami admired the staff in her hands.
"What a complete kit of powers. No wonder people call it the most invincible of the natural types."
Carina watched Nami's lightning-step and alchemy, first marveling, then wondering aloud. "I do wonder what the Vampire fruit will be like."
"Maybe fangs and a scary face," Robin said dryly.
Carina's brow filled with exasperated lines as she shot Robin a look. "Robin, don't say something that creepy."
"Can't help it. I'm jealous," Robin said plainly.
In truth, Robin wasn't jealous so much as she was filled with envy.
The Flower-Flower Fruit was handy, but compared to the Rumble-Rumble Fruit and the Bat-Bat Fruit, Mythical Model: Vampire, it felt like a trash fruit.
If she weren't already a user, with how well Yami treated her, he would surely have found her a top-tier fruit.
If that were so, she wouldn't be this weak, and she could share Yami's burdens.
Ever since they met, every place they went, Yami had to put her away in the other space.
To Robin, it felt like such an injustice to Yami.
With his strength and a record like one-shotting Crocodile, he could already make a name even in the New World and become a world-class figure.
But because of three burdens, Yami had to hold back.
Seeing all this, Robin felt deeply guilty and trained hard every day, only so that one day she could help Yami.
Before Carina and Nami soared far ahead, even if she could not catch up, she would at least narrow the gap.
Only then would she not be Yami's burden.
Of Robin's thoughts, Yami knew nothing.
If he did, he would be very pleased.
For Robin to feel this way meant her favor toward Yami had reached a very high mark.
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