Knitbone (Polish: Purpurowy żywokost) is a symbiotic root that only grows in Brokilon and is used by the dryads in conjunction with Conynhaela, a healing herb. Together, they enable the rapid regeneration of damaged or broken bones.

After the Thanedd coup, Geralt spent 36 days in Brokilon being treated for a broken leg and forearm using knitbone and conynhaela.