Compositae Silybun Marianium or milk thistle ( there are others, but this is the common variety) has long been a herbal tonic for liver damage and as an antidote to the death cap mushroom. It is currently used as an adjunct in treating alcohol damaged livers, hepatitus B and other conditions related to HIV. Ill have to dig out my ethnobotony notes for more mundane uses. They're good for warning your clan against Viking raiders.