A pyrock is a rock that has been imbued by a mage with the magical essence of fire. There are many varieties, from simple stones or gems that cannot be moved to small things that have their own inner source of manna and can be carried around… albeit with considerable caution if the person possessing it does not understand its controls (if the creating mage imbued the stone with any). If left untended in a dry environment they will quickly increase the local temperature until things near it begin to burn. Altera Loriod used one of these to destroy several books on the Southlands and Sondeck in the story "Keeping the Lamp Lit" as part of his attempt to control Charles.
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