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Anti-magic on Orcs is complete nonsense; this has been proven in more than one battle against Necromancers.
And what do Necromancers have to do with it? We're discussing the confrontation between a Knight and a Barbarian. Before you say something, at least read some of the previous messages – otherwise, you can only express your dissatisfaction that forum members are ignoring the nonsense you write.
"Strength vs. Magic" is also basically nonsense; it's only good against Chaos.
"Strength vs. Magic" is also good against Darkness, especially since a Knight doesn't have the highest magic stat anyway.
And in general, Orcs easily defeat Darkness.
Give an example (or even a replay) where a Knight easily defeats a Barbarian with "Anti-magic" using Darkness.
Added after 3 minutes
What's the problem? We take the Staff of Sar-Iss, and all your reflection goes down the drain.