I'm quite satisfied with the changes to the spell system.
Can we confirm that the sovereign cannot cast spells "globally" in Tactical combats like MOM?
1. "Flat" damage in spells
I think spell damage scaling with INT is quite a good concept, I'm not quite sure why it's removed. As pointed out earlier, there isn't really a problem with allowing limited scaling with low level spells by capping max damage (e.g. 10 + 0.4 per Int - up to 10 INT), or making higher level spells scale faster with INT.
That said MOM did not have it, so EWOM can survive without it. I'm wondering though by "Flat" do we mean there is no random variance at all?
2. INT requirements required for casting spells
I think this was an idea where forumites were stating when people talked about moving to global mana pool. I think it's not bad an idea, "warlike" sovereigns who don't have a high INT would be totally denied being able to cast high level spells or does this INT requirement work only for champions?
I also like the idea where it's perhaps not a hard limit but INT scores below requirement would mean mana cost penalty when casting by champions.
I do think that you really have to relook at your stats system, it's an aspect that I think you are not exploiting and/or balancing properly, there is so much you could do for it.
3. Additional mana pools for champions
There's really nothing wrong with the idea of the MOM system where heroes had their own seperate mana pools that instantly regenerate (some even had their own spells which made they valuable as they had access to spells you didn't).
But the lore seems to be only sovereigns could use magic, so it's okay I think if champions didn't have their own mana pools, I don't think it will make a very big difference.
Offpsring do not have to be imbued & hence you save on maintenance, but that's a very small bonus though.
4. Spell books will be all researched now
1.1 seems to be going well mostly, but one aspect seems to be getting worse. Customizing your sovereign is starting to get more and more pointless.
Some people don't like the idea that when you design your soverign you are locked out of certain possibilities. I feel that's actually a good thing!
Again MOM does it well, your spellbooks chosen at the start determine mostly what spells you can get. Being a superb game it does allow a few escape hatches including trading spells and finding spellbooks after very tough battles.
So it seems now in elemental, customization of your sovereign is mostly cosmetic? Of course in 1.0 it was mostly cosmetic, but I argue it's because of the spellbooks being exteremly similar so no-one cared not the system. And there's was a weird hybrid system where some spellbooks were only researched and not selected at the start.