The Tree Council is the group of powerful families that have the flashy visible manifestations of druidic power. Each family is known for a one or a few powerful HousePowers, along with the more conventional DruidicPowers. And of course each HouseHead ends up being the druid that helps new druids DescendToDarkness, and therefore gets DruidicInfluence…
The Tree Council has 120 members, each the head of a house.