-In the trial when the Traveler force Furina to show her power to prove that she's the Hydro Archon, Furina giving her answer that she gave up her power to the Oratrice to make indemnitium:

The funny thing is this is 100% correct, it's exactly what happened but no one believes in her even if it's true.

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-When Navia want to show that Furina is not an Archon buy using the Primordial sea if it can hurt her or not and believing she should be fine if Furina is an Archon:

The funny thing is Focalors body is made from the Primordial sea by Egeria so even in her true Archon form the Primordial sea will able to hurt the Hydro Archon and probably able to dissolve her body.

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-The thing about Furina curse of immortality is its not only giving her a long life, she also can't be hurt or get sick. She's literally invulnerable because of Focalors protection(curse). In 500 years, the clumsy human Furina will get some sort of accident but she don't have any scar or anything. Her body is perfectly preserve within the 500 years.(she still can get mental pain as she still a human)

I believe when Arlecchino tried to murder Furina, she's unable to hurt her at all. That's why she able to sense the 'curse' on Furina. There's only two thing that able to hurt/kill Furina: Focalors dies and the Primordial sea.

It's funny if they try prove Furina not an Archon by hurting her, other than the Primordial sea they can use literally anything, even Neuvillette(before ascend) can't hurt her. Even if Furina don't have divine power, her body is still the body of an Archon. I believe even Furina didn't understood about the true power of her curse, she probably can use it to her advantage.

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Feel free to disagree.

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