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A rare metal naturally imbued with magic, it is extremely dark in colour and in its unrefined state produces high levels of thaumatic radiation. When used for common purposes it will often yield unexpected results such as the great bell of Unseen University which when struck produces negative sound. The molten core of the Discworld is thought to be composed of Octiron giving rise to the strong magical field of the disc.

Compasses on the Disc are made with octiron needles which always point to the strong magical field at the Disc's Hub.

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