In the form of the radiant spirit, Nephis was much more powerful than her human incarnation. Her speed and might increased vastly, and her fire powers grew much more potent… especially when the beautiful vessel of light was augmented seven times over by her Aspect.
Not only that, but mundane attacks could not hurt her at all — most weapons would simply turn to ash before reaching her, and those that did break through the immolating heat would find no flesh to harm behind it.
Only fire.
So, what hurt her the most was her Flaw, the [Pristine Soul]… and in that form, the danger it posed was much more dire than the suffering she experienced when using her lesser Abilities. The incandescent white void of her soul was so pure and searing that it threatened to consume her, burning away her very self. Perhaps forever.