I tried xeno compatibility for the first time since a long time, it seems the amount of interspecies-breeding has been reduced a lot

[Aepdneds]

I have roughly 70 planets/habitats/ringworlds with multiple species (35 base species) on them and I have only seen 6 half species over 100 years, which transforms this ascension perk basically to a +20% growth modifier for organic species.
What I also recognized that there was no species for my void dwellers origin species, I put them purposefully on the same habitats as psionic species in the hope that I would get psi/erdudite void dwellers. Are there limitations for which species types can breed together? I think I know that lithoids can't breed with organics, but are there more limitations for e.g. plantoids/fungoids/necroids/void dwellers?

 

[Blackadder23]

Unless it's changed in a recent patch, organic and lithoid absolutely can crossbreed with xenocompatibility.

 

[Aepdneds]

Can they? I know that the wiki is sometimes a mess, but the ability to crossbreed is only ticked for biological pops, not for lithoids and I have never seen it happen. Still neither of this both point means that it is not in the code.

Species - Stellaris Wiki

stellaris.paradoxwikis.com

 

[Mcgan]

There doesn't seem to be a limitation to void dwellers either.
All I found was:

in "\common\scripted_triggers\00_scripted_triggers.txt"

is_crossbreeding_possible = {
    is_sapient = yes
    NOR = {
        has_trait = trait_machine_unit
        has_trait = trait_mechanical
        has_trait = trait_hive_mind
        has_trait = trait_self_modified
        is_half_species = any
    }
}

(Notice how Infertile clones are not excluded btw)

and in "\common\game_rules\00_rules.txt"

# This = planet
can_crossbreed_species_on_planet = {
    exists = owner
    owner = { has_ascension_perk = ap_xeno_compatibility }
    count_species = {
        limit = {
            is_crossbreeding_possible = yes
        }
        count >= 2
    }
}

# This = species one
# Root = species two
can_crossbreed_species = {
    is_crossbreeding_possible = yes
    root = { is_crossbreeding_possible = yes }
    NOR = {
        is_subspecies = root
        root = { is_subspecies = prev }
    }
}

 

[Aepdneds]

Ah, nice to see the code, someone with access should update the wiki.

 

[Mcgan]

Oh and also this in "\common\defines\00_defines.txt"

        HALF_BREED_BASE_CHANCE                = 0.1
        HALF_BREED_SAME_CLASS_CHANCE_ADD    = 0.3
        HALF_BREED_SWAP_BASE_SPECIES_CHANCE    = 0.33
        HALF_BREED_EXTRA_TRAIT_POINTS        = 1
        HALF_BREED_EXTRA_TRAIT_PICKS        = 1

So it seems it is harder to have it happen between different species classes.

 

[Aepdneds]

So if I read this correctly the normal chance that a new pop is a "half-species" is 10% if they are the same species class and 3.333% if they are different. But how does this work with planets with lets say ten species on it? Is this roled for every of the other nine species separately, or does it just roll randomly for a chosen one of the nine other species?

Also I read this:

# Root = species two
can_crossbreed_species = {
is_crossbreeding_possible = yes
root = { is_crossbreeding_possible = yes }
NOR = {
is_subspecies = root
root = { is_subspecies = prev }
}

as that already modified subspecies can't interbreed which would explain why it happened so rarely in my game, most of my species were already modified subspecies before they arrived in my empire.

 

[Mcgan]

But how does this work with planets with lets say ten species on it? Is this roled for every of the other nine species separately, or does it just roll randomly for a chosen one of the nine other species?

To be honest, I don't know, but I think the latter is more likely.