Younger Brother's Folly
Younger Brother's Will, usually referred to a simply The Will, is an organization who knows the truth of The Folly's creation. They attempt to act as the agents of Younger Brother in the world. Often acting on information that is imperfect (or nonexistent), they nonetheless have protected The Folly from destruction many times over the course of history. The Will is made up of a very small group of individuals, each of who choose a and train a successor. If the line of succession is broken, no new member can take the place of those lost, so the number of members has continuously dwindled.
Some claim that The Elder Sons were created by a traitorous member of The Will.