These high angels are of record on the superuniverse headquarters, and despite service in the local creations, technically they are residents of these superuniverse capitals inasmuch as they are not native to the local universes. Tertiaphim are children of the Infinite Spirit and are personalized on Paradise in groups of one thousand. These supernal beings of divine originality and near-supreme versatility are the gift of the Infinite Spirit to the Creator Sons of God. ~ The Urantia Book, (28:1.1)
When a Michael Son is detached from the parental regime of Paradise and is made ready to go forth on the universe adventure of space, the Infinite Spirit is delivered of a group of one thousand of these companion spirits. And these majestic tertiaphim accompany this Creator Son when he embarks upon the adventure of universe organization. ~ The Urantia Book, (28:1.2)
Throughout the early times of universe building, these one thousand tertiaphim are the only personal staff of a Creator Son. They acquire a mighty experience as Son assistants during these stirring ages of universe assembling and other astronomical manipulations. They serve by the side of the Creator Son until the day of the personalization of the Bright and Morning Star, the first-born of a local universe. Thereupon the formal resignations of the tertiaphim are tendered and accepted. And with the appearance of the initial orders of native angelic life, they retire from active service in the local universe and become the liaison ministers between the Creator Son of former attachment and the Ancients of Days of the superuniverse concerned. ~ The Urantia Book, (28:1.3)
Each universe has its own native angelic corps; nevertheless, there are occasions on which it is very helpful to have the assistance of those higher spirits of origin outside the local creation. Supernaphim perform certain rare and unique services; the present chief of Urantia seraphim is a primary supernaphim of Paradise. The reflective seconaphim are encountered wherever the superuniverse personnel is functioning, and a great many tertiaphim are of temporary service as Most High Assistants. ~ The Urantia Book, (37:8.10)
The Ministering Spirits of the Superuniverses...Tertiaphim, of origin in the Infinite Spirit, are eventually dedicated to the liaison service of the Creator Sons and the Ancients of Days. ~ The Urantia Book, (26:1.6)