Only pair a level 1 trait (such as quick) with a level 3 trait (such as genius) if you literally have no other choice or you have the level 1 Blood legacy perk (detailed further below). You should only pair 2 characters with the same level trait if they both have the second highest trait. That being said, for reasons you will see in the next section it is ALWAYS better to have one parent with the top trait even if the other parent only has the first or second level. So how does the inheritance system work? The easiest way to lay it out is like this:īase chance without legacy perks: Crusader Kings III – Eugenics 101 Offspring Through IncestĪs a bonus, if both parents have the same level of trait such as level 1 of the intellect trait (quick) then there is a 50% chance it will be upgraded to the next level (Intelligent). When the limit is reached it appears to give a 90% fertility penalty B. The player automatically has this increased by 2Įach secondary spouse or concubine increases the limit by 2 There is also a 50% chance that the limit is lowered by 1 Landed characters then have their limit increased by 2. The base starting numbers are as follows: Randomly generated characters have a fertility range of +10% to -20%Įach couple has a (presumably soft) limit for how many children they will have. This is unlanded wandering individuals that show up as guests in your court. If characters are considered “in the pool” they have a 75% penalty. If both characters are unlanded they have a 15% fertility penalty If characters are closely related they get a 10% fertility penalty UNLESS they are part of a religion with divine marriages If one of the characters is landed and they have no children they both get a 20% fertility bonus (primary spouse only) The closest modifier I could find seems to suggest that homosexual and asexual characters have a fertility penalty of 90% It does not clearly state what happens with these but at least with asexual and homosexual pregnancies become rare. Homosexual, asexual, and bisexual: Homosexual and bisexual have a 5% chance to show up for each character. Pregnancy progression chance assuming marriage at age 16 and no modifiers and no births: Crusader Kings III – Eugenics 101 Offspring Through Incest How pregnancy is calculated (checked every month because they know how to keep that sex life going in CK3):Īnd fertility is calculated (before modifiers) as: Crusader Kings III – Eugenics 101 Offspring Through IncestĬoncubines/Consorts and secondary spouses have half the fertility for all fertility checks and after every child a woman will lose 5% fertility. Before we get into traits though lets cover how exactly babies are made in CK3 Crusader Kings III – Eugenics 101 Offspring Through Incest

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