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chaos. If the hero is high enough level to move around on their own, then I find the "Armageddon" spell amusing, haha. It's such a devastating blast! But if they're moving with warriors, then "fireball" and "disintegration" are more appropriate. And if it's chaos magic + warfare (fire mage), then that's the best combination!
I disagree with DeadDreams. Okay, your hypnosis might work against bots. But do you think it will work against real players? For example, with my army, I immediately take out the hero, and teleport won't save them. And even if I don't take them out, the general confusion will win, because hypnosis only lasts for two turns, I think.