Firewyrms are creatures that breathe fire but have no wings and can bore through rock, soil, and stone. They are possibly related to dragons and have no love for men. Their young are no longer than a child's arm, while the largest can grow to immense sizes. They were encountered by slaves of the Valyrian Freehold in the mines of the Fourteen Fires. According to old tales firewyrms were in the Fourteen Fires long before dragons came.
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