Key to breeding rare dragons! (26)

Author Jorrit
Category Breeding
Stats Rating: n/a
Created Mar 11, 2014 (5 years)
Guides Back to Guide Listing
The Mechanics of Breeding

Hello guys. This post is originally from Danbr, a fellow dragon breeder who found this information on wiki. I personally think this information is pretty legit so I advise all of you who are "kind off" addicted to this game to read the below part about breeding dragons in general.

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. Each breedable dragon in the game has a particular number associated with it called its probability factor. This factor is a number greater than 0 but less than 1. It is the indiviual factors on the rare dragons that are increased by the perk Chance of Rare Dragon. So when breeding a pair of dragons with the max chance for rare dragons of 30%, a factor of .1 would become .13.

When the game calculates the actual result it does so by first determining all possible breedable combinations based on the elements of the parents. Any dragon that shares all of its elements with either one or both of the parents is included. It then determines which of those dragons is rare and increases their probability factor appropriately. Then the sum of all the possible dragon's probability factors is determined. The game then produces a random number between 0 and this sum. 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."

This is the theoretical part. For the practical example:

"Example
Say you wanted to determine the chance you have to get a Predatory Dragon when breeding a Fire Dragon and a Grass Dragon. First you would determine all the possible results:

Fire Dragon, Earth Dragon, Nature Dragon, Lava Dragon, Flower Dragon, Fruit Dragon, Grass Dragon, Spring Dragon, Tropical Dragon, Predatory Dragon

Then assuming you have no perks that affect rarity you sum all of the probability factors which in this case would be: 5.100012

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

This equates to roughly a 1.96% chance to breed a Predatory Dragon from a Fire Dragon and a Grass Dragon. 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!

Example Modified w/PerkEdit
Now let's go back to the %chance to breed rares perk. In the example above, the only rare dragon in the pot is the Predatory Dragon. 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.

This would change the sum of all probability factors in the pot to 5.130012. To determine the chance of getting a Predatory Dragon, we would take its new probability factor and divide it by the new sum: 0.13 / 5.130012 = ~0.0253.

This equates to roughly a 2.53% chance to breed a Predatory Dragon from a Fire Dragon and a Grass Dragon."

So, roughly you get 2 Predatory Dragons every 100 tries. But of course, it's not a rule, you can try 1000 times and never get it (which will hardly happen).
So, the more combinations you have, the harder it is to breed a particular dragon. Than, answering you initial question, breeding hybrids with hybrids or rares with rares/hybrids give much more combinations and then the sum of possibilities or the denominator of the calculation will be much higher; thus, it is much more difficult to breed a rare.

So, keep using single elements together with hybrids that give the least combination. That will make your chances higher. The big problems are the 4-element. They give too many. There you need 2 hybrids or 1 rare 1 single. You got the point.

Kind regards, Jorrit
  • Posted 3 years ago

    HollyWright

    none yet
    Nov 2015
    lvl 1: Loincloth
    How do you find out the probability factor for each dragon?
  • Posted 4 years ago

    Argent

    none yet
    May 2015
    lvl 1: Loincloth
    Pretty useless since the normal user has no means to find these numbers and no way (or time!) to try to do such complicated math. Put it in terms of level, breeding speed, % of rare dragon rating, or some such so a player has a chance of making a choice. Maybe some reason why one dragon with specific stats and elements will NOT breed a dragon but a second with same stats and elements but a different NAME WILL breed a rare dragon.
    But trying to do math with numbers that are impossible to find is out of the reach of most.
  • Posted 5 years ago

    Clydesmum

    none yet
    Jun 2014
    lvl 1: Loincloth
    Thank you.
  • Posted 5 years ago

    whisperedsighs

    none yet
    Jun 2014
    lvl 1: Loincloth
    I don't understand how you got 5.100012 as the probability total. There is no .00001. I keep getting 5.100003.
  • Posted 5 years ago

    theilluminator

    none yet
    May 2014
    lvl 1: Loincloth
    I like what your guide teaches about how the dragon breeding thing works. But like does it really help. Cause it doesn't change the fact that getting rare dragons is still rare lol.
  • Posted 5 years ago

    Merlinofold

    none yet
    Apr 2014
    lvl 1: Loincloth
    do you have an equation that we could use to solve?
  • Posted 5 years ago

    WightSage

    none yet
    Mar 2014
    lvl 1: Loincloth
    This is AWESOME! Thanks Jorrit :D