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After the latest episode, I have some doubt about what can kill a White Walker and why.

We know, as a fact, that both Valyrian Steel and dragonglass can kill White Walkers, and they have in common being forged by dragon fire, which I initially thought was the reason they had this power.

In the latest episode, though,

we see the Night King stand untouched in one of the arguably strongest breaths of dragon fire, made with the sole purpose of killing him

That scene gives me lots of doubt.

if dragon fire cannot kill White Walkers, why should things forged with it do it? We can argue Valyrian steel has been enchanted in the forging process, but weapons made from dragonglass have clearly not been, yet they have been shown to kill White Walkers. Why can't the dragon fire kill the White Walkers?

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    Neither Valyrian Steel nor Obsidian are forged by Dragonfire.
    – Aegon
    Apr 30 '19 at 8:16
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    I've reworded your question to the specific event we see in the show because the broader "what can kill and why" would be a duplicate.
    – TheLethalCarrot
    Apr 30 '19 at 8:16
  • @Aegon in-universe lore says so, according to gameofthrones.fandom.com/wiki/Valyrian_steel
    – bracco23
    Apr 30 '19 at 8:18
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    @bracco23 Ah Dany says "Ser Jorah Mormont," she said, "first and greatest of my knights, I have no bride gift to give you, but I swear to you, one day you shall have from my hands a longsword like none the world has ever seen, dragon-forged and made of Valyrian steel. And I would ask for your oath as well." Tbf it doesn't seem to imply that Valyrian steel has to be dragonforged. Just that Dany promises him one that will be Dragonforged.
    – Aegon
    Apr 30 '19 at 8:33
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    "She nodded, as calmly as if she had not heard his answer, and turned to the last of her champions. "Ser Jorah Mormont," she said, "first and greatest of my knights, I have no bride gift to give you, but I swear to you, one day you shall have from my hands a longsword like none the world has ever seen, dragon-forged and made of Valyrian steel. And I would ask for your oath as well."" This can be both, exclusive things to the sword. Iron throne was dragon-forged, but nothing magic on it
    – Kepotx
    Apr 30 '19 at 8:33