Intelligence: A dump stat
Right now, Intelligence is not very useful, even for a heavily spell-casting sovereign. It applies, as far as I've noticed, only to a couple non-essential spells, and does nothing much beyond damage. There's probably some other spell that uses it that someone who's explored spells a bit more than me could point out, but nonetheless, it's very sparsely used. As it stands, you're better suited just putting those points in Strength and never using the damage spells - the extra melee damage will be almost effective and won't cost you a single point of mana.
What's the solution to this? The obvious one is to make more spells INT based. But which spells could that apply to? Well, Heal is the obvious choice, and it should indeed apply to Heal. Heal is an extremely useful early-game spell, in which a number is the key mechanical component, and tying it to INT would do a lot to increase that stat's desirability. But that's the only one I, at least, can think of, and Heal by itself is unlikely to matter much in the later game. Making Elemental's spells more interesting has had the additional effect of making them lest able ot conform to a standardized formula. And a total rethinking would be out of place at this stage of development.
So, what do you guys think? What other spells could INT be applied to that might make it matter more?