In the Christian hierarchy of angels, Dominions are part of the second sphere and are said to watch over nations and regulate the duties of lesser angels. In Moses Maimonides' hierarchy of angels according to Jewish lore, they are Hashmallim, the fourth rank of angels, and are mentioned briefly in the Hebrew version of the Book of Ezekiel.
Dominions, like other angels, appear in support of Yosuga. After Chiaki sides with Yosuga, a Dominion on the second floor of Mantra Headquarters will ask the player an alignment-shifting (and possibly rewarding) question. They then appear as regular enemies in the Amala Temple and the ruins of Mifunashiro.
In order to fuse Raphael, the player must fuse a Dominion with Uriel.
"The fourth class of angels, ranked first among the Second Sphere. Their name signifies control and rule. Dominions are seen as symbols of mercy and are charged with effecting God's rule over the entire earth. They also serve to convey the will of God to lesser angels and see that it is carried out. They are said to receive orders from the Cherubim, angels of wisdom, and faithfully obey them. The scepters that Dominions always hold in their hands are held to be a symbol representing God's power. In addition to these scepters, they are also sometimes depicted as holding scriptures, swords or scales. The Second Sphere of angels was created by God to serve as the link between the order of the universe and the world of the angels. Their presence and importance are believed to be much lower than that of other angels."
—Shin Megami Tensei IMAGINE Compendium
Dominion acts as a field boss during the New Moon phase on Shinagawa field. He can be summoned by killing many of the Inviolable mobs that spawn during this phase. In Club Hourai, it is possible to engage with a Dominion through the Interaction Time System. By reaching the maximum level of friendship with him, a player can obtain a special variant of Dominion.
"The fourth of the nine orders of angels. Their duty is to oversee the other angels. Their actions are a manifestation of God's will, and they wish for their domination to be spread throughout the universe."