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Somewhere around level 4, and it’s definitely possible to train several Paladins per week if you have enough money (in which case, you can safely ignore Angels). But I’m saying that to simplify the early game, you can train a few Archers at the beginning; 7 of them isn’t that many. Although, in general, if you’re aiming for Knights, you can even skip spending money on upgrading the training hall – retraining more than seven Paladins is quite expensive, and the cheapest option, “Monk -> Paladin,” is limited by the number of Monks you have.