Coates had Storm defeat the Adversary, an upper level demon/evil god and the book was not called Storm, either.
The title doesn’t have to do with it. It’s a team book, but she is the Queen of Arrako and she definitely as the Regent of Sol is put in a position where are power is tested.
As far as the future of her powers go, she’s not limited to expressions of her mutant powers. She has divine/mystical powers. Exactly what these powers can do hasn’t been defined.
But the Arraki lived in Amenth, so they’re already pretty magical. Mutants in general
Became more magical. Forge, a Shamsn whose mutant powers is to invent things made cerebro be able to store backups of all mutant souls.