Styxx's eldest living son and the first Apollite to be born cursed. Urian was his father's most trusted warrior for centuries. He killed many of Apollo's heirs, including Cassandra and Phoebe's mother. Urian was supposed to kill Phoebe, but after seeing how beautiful she was, he saved her. Urian hid this from his father and had Phoebe drink his blood to extend her life. They lived together in Elysia in secret. Urian later helped Wulf and Cassandra escape his father. When Stryker learned of his son's betrayal, he slit Urian's throat and killed Phoebe. Acheron was able to heal Urian but could not save Phoebe. He offered Urian a choice: protect the heirs of Apollo from Stryker or have all memories of his wife erased. Urian chose to honor Phoebe and protect her family. Urian was made immortal by Acheron and exists as something other than a Daimon or Apollite.
Urian is one of the few beings who knows Acheron is really a Chthonian and lives in Katoteros with Alexion, Simi, Danger, and Acheron. After Acheron allowed his brother to live in the same realm as them, Urian quickly befriended Styxx and even had a hero worship for the man that he'd been carrying since he lived in Atlantis.
The next section contains a spoiler. Proceed at your own risk.
In Styxx, it is revealed that Urian is really the son of Styxx and Bethany. Apollymi placed him in the womb of Stryker's second wife after ripping him out of Bethany.
In Dragonsworn, it is revealed that Phoebe is still alive and trapped in Hades.