this is absurdly awesome and reminds me kinda of koA:Reckoning.
just putting this out there... what about giving bigger bonuses to the actual divination spells at higher levels?
the only one i saw, unless i missed something, was allowing them to reroll, which is very good, but in a class based entirley around divinations thematically i doesnt seem out of place to allow bonuses to the roll or hell, auto 20 at high levels?