P574:3, 50:3.1 On going to a young world, a Planetary Prince usually takes with him a group of volunteer ascending beings from the local system headquarters. These ascenders accompany the prince as advisers and helpers in the work of early race improvement. This corps of material helpers constitutes the connecting link between the prince and the world races. The Urantia Prince, Caligastia, had a corps of one hundred such helpers.
P574:4, 50:3.2 Such volunteer assistants are citizens of a system capital, and none of them have fused with their indwelling Adjusters. The status of the Adjusters of such volunteer servers remains as of the residential standing on the system headquarters while these morontia progressors temporarily revert to a former material state.
P574:5, 50:3.3 The Life Carriers, the architects of form, provide such volunteers with new physical bodies, which they occupy for the periods of their planetary sojourn. These personality forms, while exempt from the ordinary diseases of the realms, are, like the early morontia bodies, subject to certain accidents of a mechanical nature.
P574:6, 50:3.4 The prince's corporeal staff are usually removed from the planet in connection with the next adjudication at the time of the second Son's arrival on the sphere. Before leaving, they customarily assign their various duties to their mutual offspring and to certain superior native volunteers. On those worlds where these helpers of the prince have been permitted to mate with the superior groups of the native races, such offspring usually succeed them.
P574:7, 50:3.5 These assistants to the Planetary Prince seldom mate with the world races, but they do always mate among themselves. Two classes of beings result from these unions: the primary type of midway creatures and certain high types of material beings who remain attached to the prince's staff after their parents have been removed from the planet at the time of the arrival of Adam and Eve. These children do not mate with the mortal races except in certain emergencies and then only by direction of the Planetary Prince. In such an event, their children -- the grandchildren of the corporeal staff -- are in status as of the superior races of their day and generation. All the offspring of these semimaterial assistants of the Planetary Prince are Adjuster indwelt.
P575:1, 50:3.6 At the end of the prince's dispensation, when the time comes for this "reversion staff" to be returned to the system headquarters for the resumption of the Paradise career, these ascenders present themselves to the Life Carriers for the purpose of yielding up their material bodies. They enter the transition slumber and awaken delivered from their mortal investment and clothed with morontia forms, ready for seraphic transportation back to the system capital, where their detached Adjusters await them. They are a whole dispensation behind their Jerusem class, but they have gained a unique and extraordinary experience, a rare chapter in the career of an ascending mortal.