Why Jon Snow's Longclaw Kills White Walkers
Jon Snow's sword Longclaw kills White Walkers because it is forged from Valyrian steel, a fictional alloy in the Game of Thrones universe that is known to destroy the Others. According to the lore, Valyrian steel is created using ancient magic and dragonfire, giving it properties that can shatter the icy bodies of White Walkers on contact. This is why Samwell Tarly urges Jon to use the blade at Hardhome, and why the weapon is central to the fight against the army of the dead. The show confirms that regular steel and ordinary weapons simply bounce off or break against White Walker armor, while Valyrian steel cuts cleanly through them. The sword's ability to kill White Walkers is not a plot device but a core rule established early in the series and reinforced by multiple battles across the show.
Longclaw is a heirloom of House Mormont, given to Jon Snow after his execution at Castle Black. The blade originally bore the pommel of a bear, the sigil of the Mormonts, but was later reforged with a wolf's head to honor Jon's Stark identity. The sword's effectiveness against White Walkers is tied directly to its Valyrian steel composition, not to Jon's personal destiny or any hidden powers. In the show, when Jon fights the Night King and later wights, the sword consistently shatters White Walker bodies and extinguishes wights on contact. This makes Longclaw one of the few reliable weapons in Westeros capable of neutralizing the existential threat posed by the Others.
What Valyrian Steel Is and Why It Works
Valyrian steel is described in the Game of Thrones lore as a rare, magical metal produced only in the ancient Freehold of Valyria. The exact metallurgical process is never fully explained, but the show and books state that it requires spells, dragonflame, and secret knowledge lost after the Doom of Valyria. As a result, existing Valyrian steel weapons like Longclaw, Oathkeeper, and Widow's Wail are extremely scarce and highly prized. The material is distinguished by its rippled, dark surface and its ability to hold an impossibly sharp edge that never needs resharpening. In the context of fighting White Walkers, Valyrian steel is the only conventional weapon shown to reliably destroy them, making it a strategic asset for the living.
The reason Valyrian steel kills White Walkers is rooted in the fictional rules of the Game of Thrones universe, where magic and metallurgy intersect. The White Walkers are not just undead soldiers but magical constructs created by the Children of the Forest using a spell driven into a human heart. Valyrian steel, forged with its own ancient magic, disrupts and unravels that spell on contact, causing the White Walker to shatter into ice and fragments. This is different from ordinary fire or dragonglass, which also work but through different mechanisms. The show establishes that dragonglass obsidian can also kill White Walkers, but Valyrian steel is more durable, reusable, and symbolically tied to the old world of magic and power.
Dragonglass vs Valyrian Steel
While dragonglass is abundant in places like Dragonstone and can be shaped into weapons that kill White Walkers, it is brittle and breaks after repeated use. Valyrian steel, by contrast, is nearly indestructible and retains its edge through countless battles. This makes Longclaw and other Valyrian blades more practical for a prolonged war against the dead. The show's battles at Hardhome and Winterfell highlight the difference, as Jon and other characters rely on dragonglass and Valyrian steel together to survive encounters with the army of the dead.
Why Only Certain Weapons Work
The limitation that only Valyrian steel and drag