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Vic's post hit the mark with my thoughts. Almost immediately after reading Pasha's post, I wanted to ask about this exact gimmick — like placing Angels in the Citadel is cool. Despite the fact that, by my estimates, Cavaliers in the Castle turn out no worse. For example, a third-level Griffin Conservatory usually cannot be broken through with native troops (with acceptable losses) while teching up to Angels. + Stables, of course.