You unlock breeding by saving Benjamin, the Breeding NPC in Realm 17. Once you finish that realm, you can visit him in the bottom-right section of the castle to get started on breeding.

Here's what the breeding area looks like:


There's a breeding tutorial, but to briefly go over the basics again:

1. Talk to Benjamin.
2. Pick "choose the parents myself".
3. Select the first parent. This one is called the "Pedigree".
4. Pick the second parent. This one is called the "Mate".
5. Check the Offspring Details to make sure you're getting what you want.
6. Breed the creature. You will get an Egg.
7. Go to one of the five nests in the breeding area.
8. Choose "It's time to hatch an egg!"
9. Select your egg.
10. Now you have a brand new creature! Congrats.

When you breed two creatures togther, one of two things will happen. Either the combination you choose is a valid combination, and you get a new type of creature, or it isn't, and you get back a new copy of your Pedigree (the first creature you pick).

For example, if you breed a Diabolic Insurgent with an Ashmouth Cerberus, you're going to get a new Diabolic Insurgent out of it.


If you breed a Diabolic Insurgent with a Nix Creeper, you'll instead get a new Diabolic Observer.


Order matters. Swapping the Pedigree and Mate will give you a different creature. For example, breeding a Nix Creeper with a Diabolic Insurgent, the reverse of the above, you'll get back a Nix Creeper.


When breeding, be very careful to make sure that the creature on the right-hand side of the breeding interface, the Offspring, is the creature you want. If your team depends on a particular creature type, then losing that creature by accidentally breeding incorrectly can be painful.

You can find new breeding combinations in three ways. The easiest is to just breed creatures; once you've tried a combination, it'll be added to your List. The second is to find breeding combinations in the wild. There are about 3000 of them, so you'll be finding them for a while. The third is to consult this spreadsheet, which has every combination in the game: https://docs.google.com/spreadsheets/d/1IRmXn4--9fGs_jnxztXE22jx48jRqF9NlWRCFiKTQa4/edit?usp=sharing

As you battle with your creatures, you will sometimes see a message saying that your creature is "Primed". Priming and breeding creatures is the primary way to gain Heredities, which let you boost your creature's stats.

The precise mechanics around priming are not known, but generally it takes a few realms worth of battles to do, and doesn't start happening until around realm 30. The general community consensus is that priming is based around winning battles with the monster in your party.

Once a monster is Primed, the word "Primed" will appear on their character sheet, next to their level.


When you breed a creature that is Primed, the resulting creature will gain a +1 Heredity in the parent's highest stat, and a -1 Heredity in the parent's lowest stat. This calculation includes any stat changes from Artifacts, Tomes, and existing Heredites. The resulting creature will also gain all of the existing Heredities that the parent has.

Before you breed, make sure to check that the Heredities you're gaining are correct. The specific Heredity changes will be shown in the right-hand Offspring menu, as you can see here:


The maximum bonus/penalty from Heredity is +/- 15. No individual stat can go higher or lower than that, though you can have multiple +15s if you want. If your creature's total bonus would be above 15, you will lose the additional points. For example, if you breed two creatures with a +10 Int Heredity, you will end up with a creature with +15. Every plus and minus has to balance out, so this would also remove -5 of the penalties that these creatures have. Sometimes, when you overcap a bonus or penalty, the resulting creature ends up with a different Heredity array than you intended, so I don't recommend doing this if you can avoid it.

One final note is that you can modify Heredities without breeding by using Genes. After you finish the story, you will eventually unlock something called Prophecies, repeatable quests that give certain exclusive rewards. One of these rewards is a Gene, which alters the Heredity of your creature by one point up on one stat and one point down on another. Since you can't breed Nether creatures, this is the only way to gain Heredities on a Nether creature.

The benefit for increasing your Heredities is to increase your stats. The calculation for your stats is:

Base Stat * (.3 + Heredity) * (Level - 1) + Base Stat

In layman's terms: Each level, you gain 30% of what you had at level 1 to each stat. Heredities modify that 30% by 1% per point of Heredity. At +15, you're gaining +50% per level, and at -15, you're gaining -50% per level. *All stat changes are fully retroactive, so modifying your Heredities modifies your stat changes at every level.* As a side note, Tomes work by applying a bonus to your Base Stat, also fully retroactively and compatible with Heredity modifiers.

Since most of your stats come from level gains and not your starting amount, this effectively means that a +15 Heredity increases your stat by 50%, and a -15% Heredity decreases it by 50%.

When you breed two creatures together, the Offspring will have the same level as the higher of the two parents.

Tomes don't apply to Tavern matches, but Heredities do.

When hatching an egg, you will get the option to equip the egg with the Artifact and Spell Gems that the Pedigree (first) parent had equipped when you bred it, assuming the new creature is the right class to equip those Spell Gems.

You generally don't need more than one stat to be increased through Heredities. Attack for physical attackers, Intelligence for casters, Speed for creatures with traits that need Speed, etc. Getting multiple stats to +15 takes a lot of time, and isn't worth it for most builds.

You can speed up getting higher Heredities with Eggs. Occasionally you will find Eggs in realms as random loot. Hatching them like you hatch an egg you have bred yourself will give you a random creature with random Heredities. You can Prime these creatures or just breed them straight out to apply their Heredities on other creatures. You're unlikely to get a perfect roll, but this can make it much faster to get that one stat up to max.




When you're trying to breed a specific creature, remember that you can breed new creatures right away, and use this to breed normally hard-to-get creatures. For example, if you want a Dragon Queen but don't have any of the specific creatures listed in it's breeding combinations, try checking if you have any way to breed _those_ creatures first. It might take a few generations to find a set of combinations that gets you what you need, but by doing this you can breed any breedable creature in the game at Realm 17, as soon as you unlock breeding.

If you want to find out some more breeding combinations but don't want to pore through a big Excel sheet, I suggest coming to the Thylacine Discord[discord.gg] and visiting the Siralim Helper Bot in #siralim-3-bot. Simply say "!breed Volatile Phoenix" (with Volatile Phoenix replaced with the creature you're looking for) and it will tell you all the ways to breed that one creature.

Once you've accumulated a lot of recipes, you might want to use the "Show me which creatures I can create using the breeding combinations I've discovered" option. This lets you pick a recipe to breed with based on the creatures currently in your stable. Any recipe with a * next to it will create a creature that you've never had before. It's normal for this to take several (10-30) seconds to load when you choose it.

If you've got a creature that's hard to capture or breed for and you just want to reset it's Heredities, then when hatching it, use the "It's time to hatch an egg, but I don't want the hatched creature to have any Heredity". This breeds the creature like normal, but all Heredities are set to 0.

Under Options -> Gameplay -> Breeding Filter, you can change how the game will sort the creature in the breeding UI. Everyone uses a different option, but I prefer Class, personally.

In the same menu, there is an Advanced Hatching option. If you select this, then when you're hatching an egg, you can choose that egg's Strategy, Backup Strategy, Macro, and Nickname.