Concentrated Cantrips (Druid)

When you cast any cantrip of your class using a token of the living world (e.g. a branch of a 500 year old tree freely gifted to you by said tree or similar tokens) or a smaragd worth at least 500 gp as an additional non-consumed material component you add your classes spell casting ability score modifier to the damage it deals on a hit. If you cast cantrips this way you can not wield any weapons, but you may still use a shield.