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However, this update is not applied to the Ancient World.
It has some additional feature: Using Empowered and high-rarity dragons gives you an edge during breeding by unlocking new breedable dragons, The “Possible Results” button is added and new visual interface, etc.
In November-30-2020, Breeding Reborn Update was introduced. Currently most dragon's breeding times are equal to the hatch time. Previously, the breeding time was calculated as a total of the parents breeding time. The probability of getting a Pure has since (LaW update) been changed. Approximately 6:30, Septemin Tuesday, an official update in Dragon City's Facebook page showed that Rarity Boost raises the chances of getting a Rare, Legend or Pure Dragon is increased by 50%. Many of the dragons from the Deus Vault are now breedable, and are now classified as Breedable Exclusives. Sometime Mid-2013, the Deus Vault was removed from the Store. Due to the change in the status of the Pure, it and Pure Hybrids are now very easy to breed. The Pure Dragon is now an Elemental Dragon, and can be bought at the Store.
As at 26-July-2013 (LaW update), the Breeding system has been changed. Gen(eration) classification of each dragon is a DCW-made device to assist players in the determination of the likelihood of breeding that dragon. The breeding system is similar to the one from pokémon games. Breeding in normal world gains some contribution points to Breeding Alliance Chest however, breeding in Ancient World does not contribute it. If you only have one Pure Dragon, instead keep breeding a Pure Flame and a Pure Terra Dragon together, until you get either a Legendary dragon or a second Pure Dragon to breed. You'll have to wait longer on average each time, but when you fail to get a Legendary you might end up with a cool new dragon. If you'd rather get new, exciting dragons, just keep breeding combinations of dragons that both include Pure elements, for instance, Kratos Dragon + Pure Dark Dragon.
The downside of this strategy is that you'll end up with another Pure Dragon 94% of the time. Other combinations will take a longer time on average, and still only have a 6% chance. If you're trying to maximize your chances of getting a Legendary dragon, breeding two plain Pure Dragons together is your best bet, since each attempt will take 12 hours of waiting. Any time two dragons with a Pure element are bred together, there's a 6% chance that one of the Legendary dragons shows up. Breed two Pure Dragons for a chance at a legendary.