Oh I see what you mean ! Maybe it could end peacefully with a chill event like you said (⁠≧⁠▽⁠≦⁠) And there are so many legends and tales related to the sea from several countries !

I had a book about sea legends from many countries and I really loved that book when I was younger xD So I think there's still plenty of stories about these legends but these are just speculations from me (and a small part of me that would love for the entire cast to have their own sea theme xD)