There should be a way to build a "wizard" Soverign because right now, there isn't.

Yes, you can boost Int/Wis but that only changes your potential casting power, not what you can use in your everyday battle against 2 wolves.

Int/Ess should affect the rate at which you regen mana. By boosting those to become a "true caster", you are already neglecting other stats - so you should be able to rely on magic more often than warlord sovereigns.

What I mean are traits like...

Channeler: Spell costs 80% of the mana for you, rounded down. A spell always costs a minimum of 1 point.

 Master Channeler: Spell costs 60% of the mana for you, rounded down. A spell always costs a minimum of 1 point.

 Alternatively (or too)...

Some way to regen mana and/or make it possible to spend mana vs "trash".

A trait that boosts generic mana regen when in friendly territory.

A spell that you can cast on an elemental node/shrine (you can only be attuned to one shrine at a time) and that

- makes casting this element cheaper (depending on how far you are ?)

- regens mana at 1/turn but only the amount you spent on the matching element.