NOTE: All are outerversal
Metatron's Seed: these are blessings forged with the life force of the archangels. The Phoenix would be a special and unique case among the seeds.
Angelic symbiosis: The Phoenix would be a type of transcendent angel, who for ages was the guardian angel of the royal family of Ffin, especially the chosen women
Cosmic Spirit: It would be a mysterious cosmic spirit of great power, little is known about such a Cosmic entity. A superior wizard even theorized that he could be a hybrid of angel and demon, who would have the powers of Lucifer before his fall.
Awen: It would simply be the female protagonist's hidden spiritual power. She would have a supreme power hidden within her since the beginning, but she cannot access it consciously and does not even know it exists.