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Yes, Antimagic will definitely help, I guarantee it!...however, if you're playing against a mage, you can defeat him much earlier in the early game, around turn 3 or 4...you'll have an advantage in intelligence and combat ability...the main thing is to know what the mage relies on; if it's summoning, then he's unlikely to be effective with 3-4 turns of summoning 120 archers...what I want to say is that a skilled player using Haven can launch a small rush or, at least, scout out what the mage is doing...that is, the mage will focus on developing his magic and wizardry or education...
but if the game has been going on for more than two months, it will be more difficult to play against a mage...however, there is an effective solution for this situation...inspiring your troops will allow them to make good progress, and the shackle and tomb won't stand a chance...Or, you could go through Darkness and the Fallen Knight; then, the Rakshasa-Kshatriya will destroy half of his army...yes, I think Darkness is better against a mage!