Mirror Dragon

Breeding
Wanna have this dragon?

LoL, just a piece of cake, I'll tell you how to get this dragon

Then, don't brush your teeth for 1 week

Then smell your own breathe

Congrats!!! You are now a Dragon and you have Dragon Breathe!!!!

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Damage Calculator
To explain, when attacking with Legendary, Mirror deals double damage against other Legendary Dragons, and normal damage against everything else (?). When defending, Mirror takes double damage from Legendary Attacks and half damage from Physical Attacks.