Credit to Gliblord
Some poetic excerpts from:
More so even than the skeleton plucking strings bodaciously beside her, Nami felt it in her bones. Whenever Nami closed her eyes and raised her hand up, as if to stroke the underbelly of the clouds, the rest of the crew instantly understood: Something’s wrong…
The oncoming threat wasn’t your average typhoon or tidal wave or crashing rain of galleons. It was nothing she was familiar with—and that scared her even more. The words on these winds were not to be taken lightly, of that much she was unshakably certain… but they didn’t feel… dangerous? Or foreboding at all.
Presently the waves undulated in solid sheets, like tall rectangular mirrors. A phenomenon she had not only never heard of, but was pretty sure would never be explained before humanity’s extinction. The day, now misty dark, glinted brightly against the lapping mirrors, and Sunny bobbed and rocked.
Brook took his shades off and approximated a smile. His light had also been Luffy.
“When times of uncertainty roll around, we all have our symbols of faith. The totem that resonates with a comforting voice, that speaks to your soul. That is the essence of my music, and what has always kept us going.” He thumbed his fated Tone Dial playfully. “You met Laboon, didn't you?”
“Yeah,” said Nami. “And I think Luffy made him a symbol of faith with an enthusiasm that was a little on the violent side.”
“Yohoho… don't worry, I can only imagine he's taken his knocks. He is an island whale.”
“He's a durable one all right,” she said in a tone she wasn't sure whether it was trying to reassure Brook or herself. “A real durable symbol of faith.”
“Now focus on the reflection, your reflection, on the mirrors,” Brook said. “And see what you find.”
“Eh?” Had Brook witnessed this phenomenon before?
Nami squinted, but the waves crashed down quickly so that there wasn't much time to make out what was reflected. Then, she saw it… She saw an image of herself, with an island whale that was unmistakably Laboon in the background, cheering her on.
“What? But how could…!”
“All of our dreams are connected, by an otherworldly song that will never die. Like a whale song passed down form generation to generation, our will, will never end so long as we remember. That's why I can even walk the underworld without a shadow of fear, for as long as Laboon is alive, so I too will live. And vice versa. We can't lose!”
…... And the dream whale bounced between everyone's reflections as they raised rum and shocked eardrums in these, the bowels of hell itself.