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Breeding

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BreedingEdit

In order to breed dragons the player must have a Breeding Cave and a Nursery in their sanctuary. There are a few factors that will affect the possible results: 

  • The elements of the parents
  • The parent's Chance of Rare Dragon perks

Factors that do not affect the possible results:

  • Which parent is selected first or second
  • The level of the parents

To see a list of possible Dragons and their combinations, see the Dragons page. To see a visual guide to eggs and which elements they come from, see the Eggs page.

How to BreedEdit

To breed, select the breeding cave and tap on the breed button. Then select the two dragons you want to breed and tap the Start button. Dragons that cannot be bred will be darkened and unselectable with a short message on why they are unavailable for breeding. Afterwards the dragons will be in the breeding cave for a set amount of time determined by the type of dragon randomly bred. The amount of time spent in the breeding cave can be reduced with the Breeding Speed perk. After the dragons are finished breeding you can tap on the breeding cave to place an egg in your nursery if you have an available slot. The egg will then incubate in the nursery for an amount of time determined by the type dragon. This incubation time cannot currently be lowered. After the egg is done incubating you may hatch the dragon and either place it in a habitat or the resort, or just sell the dragon. Whether you choose to sell or place the dragon you will gain experience.

The Mechanics of BreedingEdit

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 and less than or equal to 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.


ExampleEdit

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 DragonEarth DragonNature DragonLava DragonFlower DragonFruit DragonGrass DragonSpring DragonTropical DragonPredatory Dragon

Then assuming you have no perks that affect rarity you sum all of the probability factors which in this case would be: 5.100003

Then to determine the chance for a specific dragon you divide that dragon's probability factor by the sum: 0.1 / 5.100003 ≈ 0.0196

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

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 5.130003. 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 / 5.130003 ≈ 0.0253.

This equates to roughly a 2.53% chance to breed a Predatory Dragon from a Fire Dragon and a Grass Dragon with +30% chance to breed rare dragon perks.

More About ElementsEdit

There are 8 primary elemental dragons whose eggs must first be bought directly from the store and placed into the Nursery to be hatched. They are: Fire Dragon, Earth Dragon, Nature Dragon, Water Dragon, Air Dragon, Magic Dragon, Light Dragon, Twilight Dragon. There is a small chance to breed a primary dragon anytime one of their elements is used in a breeding.

Any dragon with only a single element cannot be directly bred with its opposing single element dragon. These are:

Opposing element dragons include:

All opposing element dragons must be bred using at least one hybrid dragon with two or more elements. For example, to breed a Steam Dragon, you would want to use either a Fire or Water Dragon and then a hybrid dragon containing either the Fire or Water element, depending on which single-element dragon you are using.

Breeding ProbabilitiesEdit

This is a table of the probabilities of breeding a certain dragon when using the best parent elements. It does not matter which parents these elements come from, as long as all the required ones are present, with no extras. Example: Fire/River and Lava/Water can produce the same offspring. Having extra elements involved in the breeding does not prevent the potential dragon from being bred, however, it does lower the probability that any particular dragon will result from the breeding due to there being more possible offspring from the breeding.

The four opposing element dragons have two probabilities listed. The first is if you do not already have a dragon containing only those opposing elements to use as one of the parents. The second is if you CAN use appropriate opposing element dragons as one or both parents. For example: You are much more likely to get a Steam Dragon if both of its parents are also Steam Dragons, or if one parent is a Steam Dragon and the other parent is a Fire Dragon or a Water Dragon, thus limiting the pool of potential offspring.

The Primary Dragons are listed first, then the Hybrid Dragons, and finally the Rare Dragons.

Name Level Probability
Factor
% Chance
without Perks
Parent Elements
Fire 1 0.000001 100.00 Fire
Earth 1 0.000001 100.00 Earth
Nature 5 0.000001 100.00 Nature
Water 9 0.1 100.00 Water
Air 11 0.1 100.00 Air
Magic 14 0.1 100.00 Magic
Light 15 0.1 100.00 Light
Twilight 17 0.1 100.00 Twilight
Lava 1 1 100.00 FireEarth
Tropical 5 1 40.00 FireNature
Spring 5 1 40.00 FireNature
Flower 5 0.5 20.00 FireNature
Grass 5 1 66.67 NatureEarth
Fruit 5 0.5 33.33 NatureEarth
River 9 1 47.62 EarthWater
Tortoise 9 1 47.62 EarthWater
Water Lily 9 1 52.63 NatureWater
Coral 9 0.8 42.11 NatureWater
Dandelion 11 1 47.62 NatureAir
Butterfly 11 1 47.62 NatureAir
Snow 11 1 83.33 WaterAir
Phoenix 11 1 90.91 FireAir
Magic Fire 14 1 90.91 FireMagic
Crystal 14 1 90.91 EarthMagic
Pearl 14 1 83.33 WaterMagic
Wind 14 1 45.45 AirMagic
Gryphon 14 1 45.45 AirMagic
Sun 15 1 90.91 FireLight
Diamond 15 1 90.91 EarthLight
Petal 15 1 90.91 NatureLight
Rainbow 15 1 58.82 WaterLight
Seaweed 15 0.5 29.41 WaterLight
Lightning 15 1 83.33 AirLight
Light Magic 15 1 45.45 MagicLight
Fairy 15 1 45.45 MagicLight
Ash 17 1 90.91 FireTwilight
Sapphire 17 1 90.91 EarthTwilight
Mushroom 17 1 90.91 NatureTwilight
Sea 17 1 83.33 WaterTwilight
Night 17 1 83.33 AirTwilight
Black Magic 17 1 83.33 MagicTwilight
Predatory 5 0.1 01.96 FireEarthNature
Ferocious 9 0.1 03.03 FireEarthWater
Steam 9 0.1 03.03 or 50.00 (EarthorNature) FireWater or FireWater
Swamp 9 0.1 01.82 EarthNatureWater
Rock 11 0.05 02.17 or 33.33 (FireorNature) EarthAir or EarthAir
Cave 11 0.05 02.17 FireEarthAir
Desert 11 0.1 04.35 FireEarthAir
Agile 11 0.5 08.20 FireNatureAir
Chinese 11 0.1 04.17 FireWaterAir
Rain 11 0.05 00.99 NatureWaterAir
Amazon 11 0.1 01.07 FireNatureWaterAir
Obsidian 14 0.1 03.13 FireEarthMagic
Exotic 14 0.1 02.30 NatureAirMagic
Brush 14 0.05 01.89 or 33.33 (FireorEarth) NatureMagic or NatureMagic
Lake 14 0.1 03.17 NatureWaterMagic
Volcano 14 0.05 00.76 FireEarthWaterMagic
Pangolin 14 0.05 00.64 EarthNatureWaterMagic
Herbivore 15 0.1 02.70 EarthNatureLight
Natural Magic 15 0.05 00.64 NatureWaterMagicLight
Glowworm 15 0.05 00.54 FireNatureAirLight
Gladiator 15 0.1 01.85 AirMagicLight
Mirage 15 0.05 00.55 WaterAirMagicLight
Gorge 17 0.05 01.37 EarthLightTwilight
Deep Sea 17 0.05 01.18 FireNatureTwilight
Aztec 17 0.1 01.20 FireEarthNatureTwilight
Full Moon 17 0.01 00.45 or 04.76 (FireorEarthorNature) LightTwilight or LightTwilight
Sunrise 17 0.05 00.85 EarthNatureLightTwilight
Shadow 17 0.05 00.79 EarthMagicLightTwilight

Breeding TimesEdit

For a complete list of dragons including: Breeding Times, Elements, Level Available, and other useful information see: Master Dragon Chart

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