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.
 * Treesplitter, longsword of House Tallhart.
 * Defiance, longsword of House Flint of Widow's Watch.

The Riverlands

 * Piety, longsword of House Blackwood.
 * Maiden's Mercy, axe of House Piper.
 * Justice, longsword of House Mallister.

The Vale

 * Lady Forlorn, longsword of House Corbray.
 * Deliverance, spear of House Moore.
 * Tidecaller, trident of House Upcliff.

Iron Islands

 * Red Rain, greatsword of House Drumm.
 * Nightfall, longsword of House Harlaw.
 * Scourge, axe of House Tawney.

Westerlands

 * Stranger's Lament, longsword of House Banefort.
 * Sailor's Grace, longsword of House Farman.

Crownlands

 * Dark Sister, longsword of House Targaryen.
 * Hunt, the longsword of House Targaryen, gifted to the Crown Prince Maekar by Lord Samwyle Tarly.
 * Crab's Pincer, axe of House Celtigar.

Stormlands

 * Maelstrom, bastard sword of House Wylde.
 * Inkwell, longsword of House Penrose.

The Reach

 * Heartsbane, greatsword of House Tarly.
 * Vigilance, longsword of House Hightower.
 * Orphan-Maker, longsword of House Roxton.
 * Guardian, greatsword of House Caswell.

Dorne

 * Dawn, greatsword of House Dayne.
 * Scarab, polearm of House Yronwood.
 * Skullsplitter, bastard sword of House Manwoody.

Essos

 * Blackfyre, bastard sword of House Blackfyre.
 * Titan's Roar, bravo's blade wielded by the First Sword of Braavos.

Valyrian Steel with unknown fates

 * Lamentation, sword of House Royce.
 * Brightroar, greatsword of House Lannister.
 * Curved blade of Sandog the Shadow.
 * Truth, sword of House Rogare of Lys.
 * Various Valyrian Steel weapons.