>>280768915
>hachinose has in the past been both a mine and a prison
>onigashima was both a mine and a prison, and was not originally a part of wano kuni
>onigashima has a huge ancient giant skull on it. hachinose has a rather cartoony stone skull, almost like a crude replacement
Maybe onigashima was not only originally a part of hacninose, but also hachinose is a remnant of the "forbidden sun mine" from the first era

>>280021191
either turn into or summon/command hellfire serpent(s). possibly even revive the redline if it really is what became of the hellfire serpent that ended the first era

>>279956369
He hadn't eaten a DF yet so it can't have anything to do with that
random theory off the top of my head:
just like how Poseidon the 'God of the Sea' can control the Sea Kings, there is a Hades 'God of the Earth' that can control Hellfire Serpents. They can be recognized by these slit eyes. One of these ruled the world in the First Age and was a tyrant, so the only remaining association after like three thousand years and the world ending twice is that being born with snake eyes means the most evil cunt who ever lived

It's weird how two of the ancient weapons we know of have roman names while one has a greek name. I think what the reveal will be is that there are three or more 'divine lineages' that have the names of greek gods, and that to defeat and replace them, artificial weapons with roman names were built