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Dragon's Rarity

The Dragons have 3 Available Rarity up to now. They are included: Common, Uncommon, Rare. The Rarity affects so much to the Dragon's strength. It will limit the number of Dragon Ability's Ratio, Number of Skill slots of that Dragon,... And with the Higher Rarity of the Dragon, the higher stats come from the Dragon Parts to give a powerful base stat of the Dragon than others.

Dragon Skill Slots according to Rarity

The higher of Rarity of Dragon, the larger number of Dragon Skill slots

Dragon Ability according to Rarity

The higher of Rarity of Dragon, the larger Chance of getting stronger Ability
More info about Ability is here