Modding Help: How do I create an event at the birth of a child?

[Abrael]

How to make it so that when a child is born, the head of the house with a small chance appears an event in which he can choose this child a trait?

I want to do something like the conqueror trait, which will have a special casus belli against everyone and have a small chance of appearing in a newborn.

I tried to put "birth = 0.05" in the trait, but when I increased the value to see if it works, no one was born with this trait

(sorry if something is unclear, I write through a translator)

 

[rasuuru]

There is on_action called on_birth_child. I copied this example from my mod. You can see scopes you can use here:

on_birth_child = {
    on_actions = {
        my_on_birth
    }
}

my_on_birth = {
    trigger = {
        scope:is_bastard = yes
        OR = {
            scope:real_father = {
            }
            scope:mother = {
            }
        }
    }
    effect = {
        scope:father = {
        }
        scope:child = {
        }
    }
}

Just trigger an event inside effect and these scopes will be available in the event

 

[rasuuru]

Here is possible implementation (I didn't try it though):
common/on_action/my_on_action.txt

on_birth_child = {
    on_actions = {
        my_on_birth
    }
}

my_on_birth = {
    trigger = {
        exists = scope:child.dynasty
    }
    effect = {
        random = {
            chance = 5
            scope:child.house.house_head = {
                trigger_event = {
                    id = my_event.0001
                }
            }
        }
    }
}

events/my_events.txt

namespace = my_event

my_event.0001 = {
    type = character_event
    #...
 
    immediate = {
        # ...
    }

    option = {
        name = my_trait_1
        scope:child = {
            add_trait = my_trait_1
        }
    }
    option = {
        name = my_trait_2
        scope:child = {
            add_trait = my_trait_2
        }
    }
    option = {
        name = my_trait_3
        scope:child = {
            add_trait = my_trait_3
        }
    }
}

Edit: Added trigger to check if child is not lowborn: exists = scope:child.dynasty

 

[prismaticmarcus]

Moved to User Mods

 

[Abrael]

Here is possible implementation (I didn't try it though):
common/on_action/my_on_action.txt

on_birth_child = {
    on_actions = {
        my_on_birth
    }
}

my_on_birth = {
    effect = {
        random = {
            chance = 5
            scope:child.house.house_head = {
                trigger_event = {
                    id = my_event.0001
                }
            }
        }
    }
}

events/my_events.txt

namespace = my_event

my_event.0001 = {
    type = character_event
    #...
 
    immediate = {
        # ...
    }

    option = {
        name = my_trait_1
        scope:child = {
            add_trait = my_trait_1
        }
    }
    option = {
        name = my_trait_2
        scope:child = {
            add_trait = my_trait_2
        }
    }
    option = {
        name = my_trait_3
        scope:child = {
            add_trait = my_trait_3
        }
    }
}

thank you very much!

 

[Abrael]

Here is possible implementation (I didn't try it though):
common/on_action/my_on_action.txt

on_birth_child = {
    on_actions = {
        my_on_birth
    }
}

my_on_birth = {
    trigger = {
        exists = scope:child.dynasty
    }
    effect = {
        random = {
            chance = 5
            scope:child.house.house_head = {
                trigger_event = {
                    id = my_event.0001
                }
            }
        }
    }
}

events/my_events.txt

namespace = my_event

my_event.0001 = {
    type = character_event
    #...
 
    immediate = {
        # ...
    }

    option = {
        name = my_trait_1
        scope:child = {
            add_trait = my_trait_1
        }
    }
    option = {
        name = my_trait_2
        scope:child = {
            add_trait = my_trait_2
        }
    }
    option = {
        name = my_trait_3
        scope:child = {
            add_trait = my_trait_3
        }
    }
}

Edit: Added trigger to check if child is not lowborn: exists = scope:child.dynasty

is it possible to increase this chance under certain conditions? For example, if you have a certain dynasty perk, the chance will be higher

 

[rasuuru]

is it possible to increase this chance under certain conditions? For example, if you have a certain dynasty perk, the chance will be higher

Yes, you can use modifiers and triggers. Here are examples from game files:

house.house_head = {
    random = {
        chance = 50
        modifier = {
            add = 25
            has_trait = vengeful
        }
        modifier = {
            add = -25
            has_trait = forgiving
        }
        modifier = {
            add = 25
            has_any_bad_relationship_with_character_trigger = { CHARACTER = scope:killer }
        }
        trigger_event = {
            id = bp1_house_feud.0005
            days = { 5 15 }
        }
    }
}

random = {
    chance = 25
    modifier = { factor = destroy_building_soldier_multiplier_value } # chance increases with more soldiers
    modifier = { add = destroy_building_development_multiplier_value } # chance increases with development
    custom_tooltip = destroy_random_building_tt
    destroy_random_building_variable_effect = yes
}

random = {
    chance = {
        value = 10
        if = {
            limit = {
                exists = scope:wipe
            }
            add = 90
        }
        if = {
            limit = {
                exists = enemy_side.side_commander.primary_title
                exists = side_commander.primary_title
                enemy_side.side_commander.primary_title.tier >= side_commander.primary_title.tier
            }
            add = 90
        }
    }
   
    # ...
}