Oelm
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I agree, even on Jebus, building Angels in a Castle doesn't seem very worthwhile, let alone Knights. If it were a 5th-level unit, then it might be worth considering for the sake of 2 units, but here, 1 Champion and 2 Crusaders isn't enough. And breaking through with Rogues is twice as difficult without upgrading the Archers (because there's no ranged attack). But if you only play with the main hero, then you can definitely manage without the upgrade.