This would change the sum of all probability factors in the pot to 5.130012. Let’s assume we have 30% extra chance to breed a rare, which increases the Predatory Dragon’s probability factor by 30%, so from 0.1 to 0.13. In the example above, the only rare dragon in the pot is the Predatory Dragon. Now let’s go back to the %chance to breed rares perk. As you can see, rare dragons are actually pretty rare, so don’t be discouraged if you keep breeding but haven’t gotten one yet! This equates to roughly a 1.96% chance to breed a Predatory Dragon from a Fire Dragon and a Grass Dragon. Then to determine the chance for a specific dragon you divide that dragon’s probability factor by the sum: 0.1 / 5.100012 = ~0.0196 Then assuming you have no perks that affect rarity you sum all of the probability factors which in this case would be: 5.100012
First you would determine all the possible results:įire Dragon, Earth Dragon, Nature Dragon, Lava Dragon, Flower Dragon, Fruit Dragon, Grass Dragon, Spring Dragon, Tropical Dragon, Predatory Dragon Say you wanted to determine the chance you have to get a Predatory Dragon when breeding a Fire Dragon and a Grass Dragon. The game checks to see which dragon’s range of probability the number falls in with an exclusive upper bound and this determines the actual result of the breeding.” The game then produces a random number between 0 and this sum. Then the sum of all the possible dragon’s probability factors is determined. It then determines which of those dragons is rare and increases their probability factor appropriately. Any dragon that shares all of its elements with either one or both of the parents is included. When the game calculates the actual result it does so by first determining all possible breedable combinations based on the elements of the parents. So when breeding a pair of dragons with the max chance for rare dragons of 30%, a factor of. It is the indiviual factors on the rare dragons that are increased by the perk Chance of Rare Dragon. This factor is a number greater than 0 but less than 1. Each breedable dragon in the game has a particular number associated with it called its probability factor. The process of breeding dragons in Dragons World is inherently random, however by understanding how a particular dragon is randomly selected you can sometimes increase your chances of getting a specific dragon.
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