Copper Dragons are the most effective aerial defense in the game. Not only do they do considerably more damage to aerial units than other defensive structures but they also do AoE damage (area of effect). That being said, if an attacker clumps up their Bombers for deployment a Copper Dragon will make quick work of them.
The Copper Dragon however can not do damage to ground units. A popular strategy of attackers will be to attacker Copper Dragons with ground troops, destroy them and then let loose the Bombers. So it's important to put the Copper Dragons in a safe place.
The higher level your Dragon Hall, the more useful the Copper Dragons will be given your opponent's resource pool.
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