It’s clear to me now that the plague of Orïsha has never been magic at all. It’s us—Father, Mother, and me. Even Amari has been twisted by this throne. The monarchy poisons us all.
When they hell did he have time to write this being unconscious for the ride back from Abedan and then what it seems like he was locked in his room for misbehaving? He just realized what his mother did, leading to what his father did, right before Amari’s attack.