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On one English-language channel, which isn't particularly popular, there's content where two castles fight each other, each with all their upgraded creatures and a 50-week growth period. The battle takes place without using magic, with combat stats set to zero, no machines are used, and the battle itself is on auto-battle. So, the top three here are the good castles: Castle, Rampart, and Tower. As for the Conflux and Dungeon, they are solid mid-tier, but nothing more.