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Purple living bone ("Purpurowy żywokost" in the original Polish) is a symbiotic root used by the dryads of Brokilon in conjunction with Conynhaela, a magical herb. Together, they enable the rapid regeneration damaged or broken bones.

After the Thanedd coup, Geralt spent 36 days in Brokilon being treated for a broken leg and forearm and extensive use of both conynhaela and purple living bone was made.