A Reign of Toads
The Black Stone
Black stone of unknown origin has been used in the construction of several structures throughout the Known World. It is often described as oily or greasy, in contrast to similar but drier constructions of Valyrian dragonfire origin.
Legends of the stone’s fell reputation appear across the Known World, though there is no concensus on its origin or properties. It goes by a number of names, including “Seastone” coined by the Ironborn Maester Theron in reference to his own people’s connection with it.
Locations of the Black Stone
While the most infamous location where the black stone has been discovered is no doubt Asshai, where hundreds of the buildings are constructed of it, it has been found all across the known world, often in places that have a sinister reputation.
In Westeros, the seastone chair that the ironmen made their throne is famously made of it. So too is the foundation on the island of the Citadel known as Battle Island. Walls of it are sometimes discovered in the mines of islands in the Narrow Sea and beneath the waves off the coast of the fingers.
The legendary five forts north of YiTi are said to be entirely composed of the stuff (making it thousands of tons—more than four times the rest of the discovered material combined), as are some Lengish ruins deep in the jungles.
Nymeria’s exile fleet encountered the Sothoryi city of Yeen, constructed of the black stone which was so evil that even the jungle did not rise to overtake it. All the Rhoynish refugees that colonized Yeen vanished. The giant statue for which the isle of toads is named appears to also be constructed of the substance.