What are you guys thinking about this theory?
I find it good maybe pluton is not made out of seastone but it won‘t surprise me if it is .
and the thing about volcanic stones made me think about it and this panel came to my mind .
In the animr version its even more clear the vapor of melting something in the background.
The Kozuki could even have played a cruital part in building the pluton ,with there craftmanship .
The made stones that lasted over 800 years so why not make a weapon out of it to last for the same time.