A Knight + mage spells combined with a pure mage in a Lone Wolf run works perfectly (based on my experience from the beta at least).
A couple of thoughts:
- Consider giving the mage water spells instead of the Knight as a Knight has their warrior heal to full. That way both have a heal. Fire has some really nice melee spells, so that would work well with a melee character in my opinion
- I would invest in crafting as well. With crafting you can improve heavy armor and thus change the penalty to movement for the Knight to a bonus instead. It really helps with movement in combat
