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You can develop a strategy for playing against Chaos for each faction. For Dwarves, it's beneficial to use the elemental immunity rune on their main stacks; for Mages, play around magnetic golems; for Necromancers, overwhelm with hordes; for Elves, resist with the aura of horns; for Humans, rush with buffs, and so on. It all depends on the players' experience.
And of course, take magic resistance skills and artifacts.
The advice about unicorns isn't great. Today, I tried using them to protect important stacks. One spell wiped out both the unicorns and the important stacks. And then they ran away. :smile05:
Although, maybe I should have played as Mages; at least I know how to play them, and I'm not very good with Elves.