No Loss Impossible Mage Techniques

[Sky Keeper]

I'm slowly poking through impossible mage. Cleared half of vernona, almost all of rusty, ran around mines, demon island, 2 island at far north.
lvl 17.
army is usually 4 stacks or archers (inquisitors, 2 types of beholders(for the sleep), royal thorn)
and cursed ghosts with stone skin III as tank for normal mobs(4.6k leadership ghosts tank 4X 15k leadership barbarian stacks) / cyclops/paladins for undead.

Also, I have a very bad luck with caster items and running at 13 atck, 11 def, 55 rage, 50 mana now, with 0 might talents taken.
So, as you may have guessed, distortion spells(trap is a 5 mana wonder), higher magic are most used ones...don't have phoenix, target, sheep, blind or resurrection. Have one point in concentration, but it's not like I run out of mana.

I do have an occasional loss of a few ranged, but I don't really care about this, since I got my medal.

about 50% of damage is still caused by dragon, even though I use Stone wall alot... mostly to separate rampaging stack of ghosts that's 2-3 times over leadership cap from my units... and then chain cast ball lightning/dive to wear them down.
Can easily take on [very strong]. Can do [lethal] with some planning.