While I'm yet to properly use these rules, I have noticed that there's no Weapon Proficiency for Dragonstones - it's likely just a miswrite, but worth pointing out as well.
Additionally, there's two Weapon Traits named "Dark Breath", when one of them seems like it should be named something like "Light Breath" instead.
I think my final note from a casual readthrough is about Class Points - is it only Class Points that can be spent on Traits and W. Proficiencies? There's also a minor typo that states that 5 CP is gained every level, when the table immediately below seems to indicate that 5 CP is gained every season.