Gunslinger
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Well, I have an idea against the Stronghold... I would take summoning magic and use mines to the fullest, as well as buff Plague and Cursed Lands. First, they reduce enemy morale, and second, they deal good overall damage during battles. I haven't tried it, but I'll say this... what if you suddenly attack with a bunch of Hydras? They reduce morale, and then the creatures should be finished off... and in general, we need to think about which schools to use against the Stronghold... there's a choice of 4 schools.