Since you are adding new content, you don't have to have it in those files. Make a new file in the user directory. You can simply paste the stuff you took to that file and make everything there.
Yes, CoreAbilities has all the traits in it. Find Air Apprentice and copy it to do what you want.
Now you are ready to make a spell. This part is a little more complicated. You will need to find the spell that is most like the one you want to create and copy it. The GameModifier tag is the function of the spell. Several other tags decide how and when the spell can be used. The prereq should be the trait internal name you created. Hexes1. Any spell you want to be unlocked by the book simply needs to have this prereq. And to complicate that, make sure the spell also has this tag: <AutoUnlock>1</AutoUnlock> That is what tells the spell to unlock for anyone with that trait.
If that isn't complicated enough, there is a second way to do it where the trait just unlocks the spell you want. If you are simply specifying spells that are already in the game, this is easier. Find the trait for FleshBoundTome. This one has a GameModifier called UnlockSpell. Simply use this with the name of the spell you want unlocked. I believe it will unlock it for the whole faction, unless you add a prereq to the spell itself.
