I can only really guess and speculate here.
As of right now discounting the fact that at some point we’ll eventually learn how to use magic underwater. To which i can’t remember when Vetex stated it, likely in the Nimbus QnA rejoice Heat Magic users.
I’d imagine it’s due to concentration/density shenanigans or something. Where it does have a reaction to the Irradiated Seawater. But it isn’t in enough to cause any big huge reactions like Curse users themselves would.
For Mages, it would dissipate similarly to how it does out of the water when it comes to Mages. Like Salt entering a cup of water and dissolving into the surrounding water.
Magic being the Salt and the water being Irradiated Seawater of course, but at seemingly different rates?
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Fire Magic and similarly other Heat Magics would just do what they element would do underwater.
- Which inadvertently gives the impression it’s faster, when the steam created can count as part of the Spell/Magic.
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Wood and other Magics capable of being used underwater would stay awhile and disappear like they would outside of water.
This is what i guess is happening since it lines up with the implication/speculation. That Magic NRG likes to be in it’s neutral, free-flowing, non-elemental state.
For Curse users, since the Magic they produce doesn’t dissipate nearly as fast like Magic from Mages.
(idk if they are there permanently, i vaguely remember Vetex saying the Metal used in the Arena in the Second Sea would disappear eventually a long time ago).
It’s likely under the same rules here just in much larger and broader timescale.
It’s dependent on the Curse element as well - I don’t think we’d be surprised if Rupin’s Fire would dissipate underwater after awhile - but since Wotan was brought up, and the reason me using Wood as an example.
It most likely is no different than what would happen if a Mage used Wood Magic underwater. With the exception that it wouldn’t dissipate and probably sink after interacting/hitting something.
Or given speculation on Wotan, be perfectly fine material to use for boats and other Wood shenanigans he comes up with.
So yeah. . That’s all i really got speculation wise. haha