The reason Oak had been unaffected by Perona's Negative Hollows during the day was precisely because of the Haki within him. Kaido was the same.
For powerhouses at their level, the Haki within their bodies had already reached the pinnacle of this world. It was extremely difficult for ordinary abilities to affect them unless those abilities had been developed to an exceptionally high level—at the very least, to the point of awakening. Or unless they were especially unusual abilities like Hancock's, capable of being used in conjunction with certain conditions.
But even then, they still had ways to deal with them.
Using this as an excuse, Oak had Perona come closer. Sure enough, the little girl took the bait as soon as she heard it.
"Haki?"
She leaned over curiously.
"What kind of power is that? Why have I never heard of it before? And why can that power counter my ability?"
At that moment, Perona was like an endlessly curious child, completely drawn in by Oak's words.
"It can't be explained in just a sentence or two, which is why I wanted you to experience it for yourself. And Haki doesn't just counter your ghosts—it can counter all Devil Fruit abilities.
So, do you want to come over?"
Oak patiently coaxed her and extended his large hand toward Perona.
Perona hesitated for less than a moment before moving over from the other end of the bed.
"What do I need to do to feel Haki?"
After coming before Oak, she looked curiously at his outstretched hand and asked.
"Give me your hand!"
Oak did not explain much, merely gesturing for her to give him her hand. Perona then extended her well-cared-for, fair and tender little hand and placed it in his large palm.
Feeling the coolness and smoothness of