Valyrian Steel

Valyrian steel was invented in Valyria, and was used to make weapons and various other items of unparalleled quality. Magic and spells play a role in its forging, which makes the steel special and gives it magical characteristics.

Valyrian steel, possibly forged with dragons, was manufactured in the Valyrian Freehold of old. Valyrian steel blades are lighter, stronger, and sharper than even the best castle-forged steel. The blades feature distinctive rippled patterns (similar to real-world Damascus steel), the mark of steel that has been folded back on itself many thousands of times. Most Valyrian steel blades in Westeros are treasured heirlooms of noble houses, each with its own name and storied history, and even impoverished lesser houses are unwilling to give them up.

Valyrian steel was always costly, but it became considerably more so when there was no more Valyria, the secret of its making lost with the Doom. Only the greatest weaponsmiths can reforge swords from existing Valyrian steel, making those remaining weapons highly treasured and extremely rare. The blacksmiths of Qohor claim to know the magics for reforging Valyrian steel without losing its strength or unsurpassed ability to hold an edge.

The North

 * Longclaw, bastard sword of House Mormont.
 * Ice, greatsword of House Stark.
 * Thunderer, mace of House Ryswell.

The Riverlands

 * Piety, longsword of House Bracken.
 * Conqueror, longsword of House Vance of Atranta.
 * Wisdom, helmet of House Mooton.

The Vale

 * Lady Forlorn, longsword of House Corbray.
 * Lamentation, longsword of House Royce.
 * Siren's Song, axe of House Sunderland.

Iron Islands

 * Nightfall, greatsword of House Greyjoy.
 * Red Rain, longsword of House Drumm.
 * Tribute, polearm of House Blacktyde.

Westerlands

 * The Horn, lance of House Brax.
 * Boar's Brunt, warhammer of House Crakehall.
 * Pennance, longsword of House Lannister of Lannisport.

Crownlands

 * Blackfyre, bastard sword of House Targaryen
 * Dark Sister, longsword of House Targaryen.
 * Crab's Pincer, axe of House Celtigar.
 * Torrent, longsword of House Bar Emmon.

Stormlands

 * Lamplight, mace of House Horpe.
 * Carapace, shield of House Estermont.
 * Just Maid, longsword of House Tarth.

The Reach

 * Heartsbane, greatsword of House Tarly.
 * Vigilance, longsword of House Costayne.
 * Orphan-Maker, longsword of House Roxton.
 * Cinder, longsword of House Ashford

Dorne

 * Dawn, greatsword of House Dayne, not made from Valyrian Steel, but a fallen meteorite though it has many similar qualities.
 * Pride, longsword of House Santagar.
 * Dusk, longsword of House Uller.

Valyrian Steel with unknown fates

 * Brightroar the greatsword of House Lannister
 * Many unknown blades