The Dwarves have a very cool thing – "Runes." And so-called, "Runic Magic." In addition to the spellbook, magical symbols are drawn above the turn order bar. They can be used by any units in your army. Many of them are extremely useful. For example, you take the Energy Rune, and your units have a huge attack range, etc.
Added 4 minutes later
I have another question: in the last mission of the last campaign, Kujin, Godric's daughter, Ilaya, and Wulfstan will fight the demons. Am I right? So, I need to level up them. This is also clear, except for one thing: how do I level up Ilaya? I can't play as her; she just talks to Zehir at the beginning and end of the first mission of the mages. And that's it.