Conynhaela is a type of climbing herb which grows in Brokilon that enables the rapid regeneration of bone tissue. Despite this, only dryads know how to use it, by having the plant's roots literally penetrate the patient's skin, which simultaneously allows the use of a second symbiotic plant known as knitbone. However powerful it is in healing though, it appears to cause those being treated with it to lay motionless while raving away.[1]
The skin of the cured person retains permanent, visible dark spots left wherever the roots entered the body. However, a bigger side effect is caused when it's combined with the magical reconstruction done by dryads. While any bones are healed they cause a minor issue with one's nerves, making the healed person's joints more sensitive, especially in the cold and when it's about to rain, similar to arthritis.[1]
In July 1267, after the Thanedd coup, Geralt spent thirty-six days in Col Serrai being treated by Aglaïs for a broken leg and forearm with conynhaela and knitbone, to which he made a full recovery.[1]