where Silver takes in a disciple since he discovered she was able to use ancient magic but was deemed unsuitable to learn magic by the academy (well it was more like some noble kid didnt like the idea that someone else was able to decrypt ancient magic but unlike him, had the magic power to actually handle the said magic so you can prolly assume she was bullied/pressured and eventually bought her silence to further that guy's own goals.. silver saved her since he found out the reason the girl was working hard was also to help her ailing mother which was similar to how he worked hard to learn ancient magic).. not sure where it got mentioned but it should be one of the reasons he sought a means to help his mom, and coincidentally found the ancient book where his grandfather was trapped in... afaik, he isn't interested in the throne, but since they're born to royalty, they were viewed as potential threats by their fellow siblings who wanted the throne for themselves so they are forced by the situation since it's either they're going to be killed by their siblings to get rid of the possible rivals for the throne or they have to make a stand themselves just to survive. iirc, there was one gaiden chapter that showed how Al and Elna first met and at the end, Al and Leo's mom was coughing a bit (shouldnt be a simple cough tho).. i think it was also mentioned on the sebas gaiden chapter, and on another one where the King and their mom were conversing while looking at the 2nd consort's preserved remains (Lizelotte's and christa's mother iirc)
**found sth
In ch205
"Around 13 years ago.
It was the first time I learned of my mother’s illness. No matter which doctor came to treat her, they all gave up.
To find a way to cure that disease, I have read many books. In the process, I learned about my great-grandfather who was obsessed with ancient magic. After my investigation, I discovered a secret room that only those who have the aptitude for ancient magic could open.
I searched the secret room and released my great-grandfather who was sealed in a book and learned ancient magic from him.
Up until now, I wonder if there is a time I put in so much effort to do something.
Approximately 2 years later, I have mastered a certain level of ancient magic and tried to cure my mother with the healing barrier.
However, there was no effect. In the face of my mother’s disease, ancient magic was useless.
There was a barrier in my mother’s room that made her condition gradually grow worse. I could destroy it but the barrier’s purpose was only to accelerate the disease that already exists in her body.
It was a disease that Mother originally carried and there is nothing I can do about it."