"The Legend". Problems with the walkthrough.

I'm actually about to take Karador, but I still have almost all my Dwarf troops left – should I go back and switch them to Serpents (since I have a bonus for them)? Or Elves? Dryads? What battle tactic should I choose if he has 200 mana and constantly revives strong stacks? I can only move (cast spells) once per turn...
P.S. Mirror of Pain (I have 108%) – why does it deal so little damage?

Unicorns and their dark counterparts are very good, as they have increased damage against the undead :). You can also upgrade "Tolerance" and take Necromancers – you'll be able to raise Karador's troops yourself and block the crystal for two turns. It's also a good idea to take Elves (archers) and Inquisitors (they also have increased damage against the undead). At least, that's how I did it. In battle, Lyra will be very helpful: her spell will tear the crystal to shreds in a few turns. The Reaper with "Black Hole" will also kill a lot of troops. Just look at the situation ;).

Morning, you just don't understand. Your previous posts in this thread. And not just this one.