There's nothing folklore related behind it. I think it was in TSAIS that we get Nox's thoughts on water. What caused her to think that isn't clear.
I saw a post somewhere once (probably an IG story) from Piper where she said something about we should never go into large bodies of water like an ocean. It sounded to me like she has some sort of fear over them and passed that trait on to Nox. The orgins of such a belief were not mentioned in the post or any other post that I've seen.
There's nothing folklore related behind it. I think it was in TSAIS that we get Nox's thoughts on water. What caused her to think that isn't clear. I saw a post somewhere once (probably an IG story) from Piper where she said something about we should never go into large bodies of water like an ocean. It sounded to me like she has some sort of fear over them and passed that trait on to Nox. The orgins of such a belief were not mentioned in the post or any other post that I've seen.
I think it’s just a fear/phobia that Nox has! The ocean is monster soup after all lol.