I had a feeling he was cleansing Harald as well, but the decay angle is very interesting. Tsuru can do something similar with her DF too, which is probably why Doflamingo was scared of her too.
Your part about destruction is interesting too, I was gonna say it makes me think of Shiva but you mentioned him too ofc lol:
It also makes me think of this amazing song and tragic story from Final Fantasy XIV (I've not played the game though, I don't even remember why I know about the song anymore lol.) :
Hi, sorry for the late response. I like the example you brought up with Tsuru and Doflamingo. (A good reminder of how broken devil fruit powers are that work by touching someone).
Tsuru is an interesting candidate to test her powers out on domi reversed characters.
Interestingly enough that Doflamingo also mentioned something about "rotting" away, which could be a parallel with the Nidhogg chewing on the World Tree and slowly decaying it.
(Although Dofi talks about something different here)
Miss him. Hope he will return to the Story.
Yeah, the destruction thing is interesting to me as well, because Nidhogg is often associated with destruction and evil, but there is another part to it. The necessity of balance. Destroying old things to create something new, which gives some sungod nika / luffy vibes, which I'll get to in your second post. Apparently, Shiva works in a similar manner (but I would have to read more into it)
I'll have to admit I've never played Final Fantasy either. I only know that the nidhogg appears in one of the Games.
Heard only good things about the franchise in General.
Very catchy soundtrack btw, listened to it twice on my way home.
Oh god, that translation thing, nidhoggr / nidogga, and that laugh, fits perfectly. Okay, I am sold on it.

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@Moewu Some more to the post I was meant to add earlier, I hope my posts and thoughts make sense lol:
Ni-ka and Ni-dhogg?
This needs to have some payoff somehow too:
Very nice summary and a good example of that song you brought up. Perfectly mirrors the way the Nidhogg is described in the Norse texts and can be applied to Loki as well.
Apparently, Loki dies during the events of Ragnarök, but the Nidhogg survives. (We know that devil fruits respawn.) I don't know if that's a foreshadowing for something (I hope not)
Seeing that panel with Sun God Nika again, who is said to be a destroyer or savior of the world, makes me totally understand why Loki thinks he is the Sungod.
Madame Shyarly's prophecy about a man with a straw hat destroying Fishman Island also comes to mind.
I know there is a popular theory about Catarina Devon impersonating Luffy and attacking fish-man island, but what if Luffy is really the one that attacks / destroys it ? Maybe for the greater good ? The Sun Tree Eeve also has its roots down there, perhaps it will have something to do with it.
In retrospect, it wouldn't be too shocking if Luffy really did it. He destroyed things before for the "greater good".
Namis Room in Arlong Park would be the best example of that.
I just can't think of any good reason for the destruction of fish-man island, yet. I know about the infamous destruction of the Redline theory. That could result in that, by accident ?
Or perhaps Loki will start something and later lead to that. We still have the situation with Mosa / people thinking it's Shirahoshi, and their call finding an abrupt end. If something was happening right now, I would imagine Loki storming off to go and help her, though now that he has a devil fruit, how would he reach it, lol. I doubt he has any coated ship of his size nearby.
Unless she got kidnapped by the time we return to the present, and is elsewhere now, because there is also this time phenomenon going on in Elbaf. Or Mosa isn't Shirahoshi and Oda fooling us all? So many questions, I feel like I am making things too complicated in my head.
Ay ! The mermaid quintruplets, how could I forget about them. Oda definitely choose "Nikas" design on purpose, matching one of Luffys striped shirts.
But on a serious note, yeah, naming one specific mermaid, Nika, could have more meaning behind it. "They are well-informed" on top of that. Would have to dive more into that separately. Certainly some people theorized about them already. Good that you brought that up.