Tactics for playing as the Dwarves.

I personally like Ingmar; he's the easiest to start with, and he's quite good. I develop him like this: I immediately boost his defense, then his attack for his archers (the initial ranged units are a bit weak, but they become useful), and I also think it's important to choose other skills, for example, Battle Madness, and so on... I also increase his luck; this is just in case the enemy has a larger army, as it can influence the outcome of the battle. I prefer to develop his Inferno magic; you can also choose Light magic (for resilience; I like the Mass Stone Skin ability and others). Of course, sometimes you don't have time to develop him that much because the enemies die faster. Does anyone know and can explain what the point of developing his Wizardry skill is? Maybe it's obvious, but I've been playing for about two years, and I haven't figured out what it gives. Explain it to me, a simpleton :-):-)