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Several of Iris abilities had awakened into superior and greater versions of themselves, such as her Undying Body which became Spectral Body, giving her very body the amazing power of being half-specter, as long as she had mana, she could easily regenerate or turn completely into a specter temporarily, becoming immune to physical damage unless it were to be infused with mana.
Additionally, any wound she received would only be made her bleed if she desired, as these wounds would simply be pieces of her spectral being that fell and would easily regenerate.
She was even able to use the wounds caused to her ad generate little spectral foxes that could curse anything that they touched.
She was also able to coat herself with her very Soul and Aura, taking the form of her Soul Beast and becoming a monstrous beast made of blue flames with gigantic maws and poisonous claws, making her even deadlier.
Check "The Protagnist's Sister Is Actually the Strongest"!