A Principle Entity/Prime Entity is an empowered and Higher Order being capable of sublimating Essence. This usually takes the form of a Divine Principal/Patron/Intermediary, Greater Animus. Such creatures leave behind Primaeth remains from direct engagements.
Elan Building: This particular activity, along with Mystic Offerings to or time serving a Prime Entities, Time in Service to Prime Institutions or Entities, acquiring knowledge and experience arduously and over great amounts of game time (beyond Character Inception), Acts altering the outcome of great conflicts or the lives of many in general, and enhancing capabilities to an epic level can all build Elan.