I hope he shares what he found out with the school.
"So the ethos book queries for your desire, and once it finds a response in your thoughts it curses you to achieve said desire through any and every means. For me, it was the destruction of all black companies, which already no longer exist in this world, so the curse was instantly resolved and removed itself before I had a chance to dispel it.
As for everyone else who read this book before. The ones who ended up doing crazy stuff would be because of this curse. And if you can dispel it then you would be safe from that, And all the ones who mysteriously disappeared, that would be because of the third magic this book teaches: [Ultra expensive Ultra fast Flight magic]. I almost ran into the same 'trap', but survived thanks to my insane mana pool and my tamed animals cautioning me to return instantly as I disappeared faster than expected and they felt lonely after 2 seconds. And even then I almost ran out of mana at a lethal height, far out over the ocean."
They might have some way to automatically determine if he's currently suffering from a status ailment or not. Then again, everyone who read the book of ethos went on to do something crazy, so despite all the protections they have on the library many can get in, read the books and then go out and go nuts.
I thought that, if they confirmed he didn't suffer from mental erosion, they would ask him some questions about the book so that they can learn what kind of content it has without having to deal with the mental erosion.
Yeah, was surprised there was no procedure done after reading. Nor even asking for info.