Purview, Marvel, Boons : What is “Motifs”?


I don’t understand the concept of "motif" in Scion: Hero p236-237

For example:

  • I’m a Scion of Ares, and I want to use a Marvel of my War Purview to "Bless" me for combat. What should i do ?

  • I’m a Scion of Susano-oo and want to use the "Flight" boon. What should i do ?

  • I’m a Scion of Hel, with the Passion (Fear) purview. As specified p256, I could create a motif based on Fear. How this works concretly ?