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After carefully analyzing the gameplay, I've concluded that Crusaders are more useful than Monks when fighting neutral creatures and other players.
Double Strike is good, but they move very slowly. By the time they reach the enemy, there might be nothing left to attack. There's no way to increase their speed.
By the way, Necromancers have a great ability that helps them defeat any commander with all their upgrades in the early stages of the game, especially when the commander has a strong army. Approximately 80%-95% (as I believe based on the games I've played) IF the armies are roughly equal. This is due to the ability of the demons.
Necromancers generally excel in necromancy, excuse the repetition. They almost always have a larger number of units. + I agree that Ice Demons again provide a numerical advantage!