Juristis
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I killed the demons on the first try, losing 5 pikemen, archers, and 1 swordsman. They had a couple of morale drops, but I didn't. The angel stack is easy to take if they don't have morale, but a good strategy is definitely needed in a real game.
I fought the minotaurs a couple of times, losing about 20 units, 3 trebuchets, and some ranged units. They had a couple of morale drops each time. In a real game, I wouldn't be able to defeat them with basic ranged attacks. I'm sure it's possible to put up a better fight there, but it's a risky endeavor, in my opinion.