I took a look at your save. You're lucky I'm having some stomach problems so i'm stuck at home
First, about your character:
1) do not invest in transmute skill too early. You noticed yourself it wiped out your might runes, which are always in short supply for mage.
2) investing in wisdom gives only 6 mana, leave it for lot later. You want to pump up important skills first as a mage- chaos and/or distorsion magic.
3) do not invest in glory either. Again, you need the runes for magic skills.
4) i see you had trap spell available but did not buy/use it. No loss on impossible without kiting is difficult especially at the beginning, you have to take every little help game has to offer. Fights in Debir are easy, surely you could have squeezed some traps in? Getting it to at least level 2 means slowing down enemies+damage. The same goes for casting stone skin and getting the Guardian medal.
5) definitely take 4 archmagi from tower in Scarlet. They're sturdy, ranged, can push the enemies back, magic shield ability, chance to lower speed, help with guardian medal... as a replacement for archers.
6) you only have one unit which can resurrect, so you cannot afford to lose much and of one type of unit only. Swordsmen will have to go. replace with polar beers from Bolo
7) you're spending crystals on spells you will never use as mage- nature call, guardian angel, dragon arrows... save crystals
as a mage you only chance at the start is ranged damage, spell damage, no retaliation damage. So preferably no melee units apart from snakes or very sturdy ones - reason why swordmen have to go
9) fear is a great spell. therefore you need to remove units level 1-2 from your army - reason why archers have to go.
As a mage you have to choose which way to go and specialize. Distorsion and buffing/debuffing enemies? Then go for distorsion 2 quickly, keep casting slow, fear, dragon kick back, send summoned thorns forward with archmagi magic shield to occupy the enemy, and shoot. or Spell damage. Go for chaos 2 fast = stronger spells, longer fear spell, again attack from the distance.
Hmm, with you current state of affairs it is not exactly brilliant. Get +1int headgear from debir underground. go to bolo and collect unguarded rusty anchor map from in front of erica tent, you only have to avoid those barbarians by the boat, if you wait for the right moment. On rusty you will find paladins in the tavern...
good luck!