Nicholas Foundation

Nicholas Foundation is a, presumably, secret magic-side organization related to Santa Claus. Leivinia Birdway refers to it when she mistook the child Fremea Seivelun's comment that she knows Santa Claus exists as a deliberate reference to the organization.

It is unknown if the organization has an actual Santa Claus as Leivinia's reaction implies that the Santa Claus the character, exists.