Cuendillar

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Wikipedia has an article about this subject at Concepts_in_the_Wheel_of_Time_series#Cuendillar. This page aims to provide supplemental material not suitable for a general encyclopedia... such as detailed plot analyses, summaries, or fandom.

Cuendillar (pronounced CWAIN-de-yar), also known as heartstone, is an indestructible substance created during the Age of Legends. It absorbs any force attempting to break it (including the One Power) and is believed to become stronger as a result.

[edit] Uses

Because the making of it has been lost since the Breaking of the World, cuendillar is extremely rare and valuable. The Seanchan High Lord Turak had a vast collection of it, which both contributed to and signified his power. Cuendillar is the material that was used to make the seals to the Dark One's prison, and a number of other artifacts are made of it. Not even balefire can damage it.

However, some of the Great Seals have weakened, and some of them have been found in pieces - something unprecedented in history. It is unknown what power caused them to break, but it is generally believed to be related to the Dark One breaking loose.

[edit] Rediscovery

Egwene al'Vere was able to reconstruct the weave for making cuendillar from iron; not only has this allowed the rebel Aes Sedai a source of income for their siege on the White Tower, but it has factored into their plans heavily.