First, the White Walkers possess intelligence, emotions, and mastery of ice magic. This was already shown in the prologue of the first volume of A Song of Ice and Fire. The White Walkers not only killed the Night's Watch rangers but even mocked them verbally.
Second, the White Walkers are extremely powerful. They wear ice armor, wield ice swords, and are created through ice magic. According to the author's own worldbuilding, the White Walkers are almost akin to ice elves, with a relatively high level of civilization.
Third, the Long Night is a global catastrophe. Daenerys might choose to ignore Westeros, but she cannot escape the Long Night—there's simply no place to hide from it. George R. R. Martin was heavily influenced by The Lord of the Rings; the Long Night is something even more terrifying than Mordor or the orcs. In The Lord of the Rings, even the peaceful Shire of the kind-hearted Hobbits was ultimately destroyed by Saruman.
In other words: When the nest is overturned, no egg remains intact.
The emergence of Daenerys and her dragons carries a purpose—she is destined to become a central force in the resistance against the White Walkers. That is her responsibility.
Hiding out in Slaver's Bay and waiting for the Long Night to pass? That's impossible. If the White Walkers reach Slaver's Bay, then the Long Night will never end.
As for whether fighting the White Walkers is dangerous—of course it is. Death means true death. But at this stage, the Wall is merely the starter zone, the best place for a novice to level up. If one can't even survive the starter zone, then the future...
Fourth, the matter of the power system. Some readers ask whether Daenerys has become invincible and is upsetting the balance.
To be honest, she kind of has.
Mainly because the dragons no longer have weaknesses. In the original work, scorpion ballistae and the Night King were nearly perfect counters to dragons—just as dragonfire perfectly counters the undead.
But after Daenerys crossed over, there's no longer any chance her dragons will be struck by scorpion bolts. This has effectively removed the dragons' weakness.
With no weaknesses, the dragons appear overpowered, and Daenerys, having dragons, becomes overpowered too. Still, I won't change that. I won't have her dragons shot down by arrows.
As for whether Daenerys herself is invincible?
No—she's still far behind Melisandre.
In A Song of Ice and Fire, what level is Melisandre at?
She no longer needs to eat, drink, or sleep—things normal humans require. Her magical power is nearly limitless, she has lived for centuries and will continue to live. The red ruby at her neck isn't a weakness—that was a creative liberty taken by the Game of Thrones showrunners. More terrifyingly, she is a priestess—a priestess of R'hllor, the Lord of Light, and he stands behind her.
Then there's the power of the Greenseers—was it exaggerated?
Just Bran crossing timelines and turning Hodor into Hodor is enough to show how powerful he is—almost godlike.
Under normal circumstances (without the main character crossing over), Bran could control each of Daenerys's dragons and take them away.
Lastly, the strength of the White Walkers—or more specifically, the Night King.
Here's a simple question: if Valyrian steel swords alone were enough to end the Long Night, why would Azor Ahai need to forge Lightbringer?
Back then, there were other metals with similar properties to Valyrian steel—such as dragonsteel.
(End of Chapter)
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