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Crusader Kings III Mods Catalogue

[EE] EK2 Heterochromia for Vanilla CK3

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Authors: EnumaEllis, spinning into a tizzy

Last revision: 10 Dec, 2025 at 17:55 UTC

File size: 28.89 MB

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Description:
What this mod does:

This mod port the Heterochromia eye gene from Elder Kings 2 into vanilla Crusader Kings 3.
Elder Kings 2’s modder Buck split the eyeball models into two separate eyes, Left and Right, giving it the ability to split their color values for each. My mod simply adds this ability into the game, and giving the heterochromia gene to the Left eyeball.
In addition, I will also add a eye pupil gene that stabilizes the lighting around the eye.

What is the rate of Heterochromia and who can get it?

A flat 4% for all cultures. If you think this is low, EK2’s rate is 1% for most of their races.

Is it hereditary?

It is NOT hereditary. It is the same in EK2.

I don’t see the options for Heterochromia in Ruler Designers?

This is by design. Since Buck replaced base game eye gene, and base eye gene count as ‘accessory gene’, it is essentially treated as cosmetics and won’t appear in Ruler Designer, even if you use Agami’s mods. This can be changed, but I am not touching UI moddings.

If you want to force heterochromia in Ruler Designer, all you have to do is copy the persistent gene code into a document, find the eye_L_accessory gene and modify it. Example below:

eye_L_accessory={ "normal_eye" 0 "normal_eye" 0 } – Change the normal_eye to heterochromia and voila!

Can I choose my heterochromia color?

Buck specifically made it so the colors are chosen by its opposite in the color palette, so your base eye color is what makes a difference.

Some colors are too bright?

That’s the result of EK2 shaders with vanilla lighting. I won’t fix it. This is just a port.

Would it work with [insert] mod?

No idea. Mine adds new eye genes that should generally be compatible, but I wouldn’t go mess around with other gene mods that adds in their own eye genes, or custom shaders. This is for you to test.

Would I make a compatch with [insert] mod?

Someone is welcome to, I won’t. I’m not actively playing CK3 anymore.

EK2? Why not use A Game of Thrones?

AGoT modders takes a less customizable approach by having scripted, set eye colors variants. I am not interested in this method. I want it to happen organically without a bunch of script selectors.

Can you port the other EK2 genes to base game CK3?

I already did for a separate private mod. If I were to publish it, the issue is the scriptings to separate the races and history editing; it would take so much work and so much maintenance that I would never be able to do it myself, and I have no interest in CK3 anymore nor teaching others to maintain it.

Here is the video that showed my test:
https://youtu.be/j_Eg7-XdMzg

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