How does she become his phero in the end?
Spoilers ahead in 3, 2, 1....
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Basically, if my novel memories are remembering right (and bear with me since it gets a lil jumbled in my head) Diello and his intelligence network finds out what the conditions are to whoever becomes the head's ferro which is basically (1) who was the person most integral to you that you shared a really traumatic situation with in your formative years, and (2) have a strong emotional connection that comes with it/or at least have known by then that creates the bond. This one needs proximity of sorts i.e. being someone in your inner circle or smn within the town which adds a layer of connection or at least this is how I understood it in the novel. The mtl of the novel is a bit jumbled and the general grammar and formatting was a bit nauseous to read even back then.
Why Diello has the traitor lady become his ferro is essentially because he remembers her to be the one who helped him when he was trapped in a fire with when he was a child and his psycho parents left him to burn in his room as a means to awaken his powers when he was already a child scared of the fire. Crua saved him (hence she has nightmares of a child trapped in a burning building who she drags out) but because our current Crua is a novel reader who doesnt retain majority of her OG's memories, she doesn't have that trauma bond of sorts and before a link can be established further, its severed because she lives in a different dukedom altogether which doesnt allow condition 2 to be met. Instead, after her younger self gets him out and leaves, the other traitor lady in the chaos notices young Diello and with his mind in a daze that's who he mentally remembers being there at such a traumatic time. That's how the ferro sigil forms on her because she achieved sharing a very traumatic moment with him and they had proximity that would naturally establish a supposed deeper bond cuz she was an Arzienta and would be around before betraying the dukedom later on.
When they do find this all out, by that point traitor lady in her desperation to get out of her imprisonment because she realized she didn't become ferro cuz she was especyal ala cart and that the conditions to being a ferro could possibly be replicated (crazily enough lol) she tries to dip. She fails to use the mixed fire and water power she has and ends up rampaging using the Allore's core within her becoming a human bomb that would decimate all the intelligence agents and even hurt Crua and Diello within the explosion radius and I think it's this traumatic situation fighting to save the agents to her capabilities that Diello and Crua share a traumatic event and the ferro sigil acknowledges Crua to being Diello's actual ferro after the old one dies and they shared such an emotionally trauma bonded situation. If it isnt this one and Im misremembering, something happens in the future that makes their trauma bond connect them both as actual ferro and duke haha hope this helps Im fighting for my life to remember
ε=ε=(ノ≧∇≦)ノ










Does the ml suffer? because i want him to