Request Incursion

is_available = OR = {
	AND = {
		has_trait = fp3_struggle_detractor
		any_character_struggle = {
			is_struggle_type = persian_struggle
		}
	}
	top_participant_group:dynastic_cycle ?= {
		participant_group_type = expansion_movement
	}
}
trigger_if = {
	limit = {
		is_ai = yes
	}
	ai_greed <= 25
	OR = {
		has_trait = fp3_struggle_detractor
		AND = {
			vassal_contract_has_flag = celestial_military_appointment
			top_participant_group:dynastic_cycle ?= {
				participant_group_type = expansion_movement
			}
		}
	}
	NOT = {
		culture = {
			has_cultural_pillar = heritage_turkic
		}
	}
	ai_has_builder_or_pious_builder_personality = no
	is_at_war = no
}
is_shown = scope:recipient = {
	is_playable_character = yes
	is_landed = yes
	trigger_if = {
		limit = {
			scope:actor = {
				top_participant_group:dynastic_cycle ?= {
					participant_group_type = expansion_movement
				}
			}
		}
		top_liege = scope:actor.top_liege
	}
	trigger_else = {
		OR = {
			any_character_struggle = {
				is_struggle_type = persian_struggle
			}
			title:d_sunni.holder ?= this
		}
		top_liege ?= this
	}
	is_ai = yes
}
scope:actor != scope:recipient

As written in game/common/character_interactions/00_fp3_interactions.txt.

on_accept = if = {
	limit = {
		exists = scope:secondary_recipient
	}
	scope:recipient = {
		if = {
			limit = {
				scope:actor = {
					top_participant_group:dynastic_cycle ?= {
						participant_group_type = expansion_movement
					}
				}
			}
			capital_county = {
				save_scope_as = invasion_target_title
			}
		}
		else = {
			if = {
				limit = {
					any_realm_county = {
						this != scope:recipient.capital_county
						any_neighboring_county = {
							holder.top_liege = scope:secondary_recipient.top_liege
						}
						any_county_province = {
							geographical_region = world_persian_empire
						}
						NOR = {
							holder = scope:actor
							holder = {
								is_vassal_or_below_of = scope:actor
							}
						}
					}
				}
				random_realm_county = {
					limit = {
						this != scope:recipient.capital_county
						any_neighboring_county = {
							holder.top_liege = scope:secondary_recipient.top_liege
						}
						any_county_province = {
							geographical_region = world_persian_empire
						}
						NOR = {
							holder = scope:actor
							holder = {
								is_vassal_or_below_of = scope:actor
							}
						}
					}
					save_scope_as = invasion_target_title
				}
			}
			else_if = {
				limit = {
					any_realm_county = {
						this != scope:recipient.capital_county
						any_neighboring_county = {
							any_county_province = {
								geographical_region = world_persian_empire
							}
							holder.top_liege != prev.holder.top_liege
						}
						NOR = {
							holder = scope:actor
							holder = {
								is_vassal_or_below_of = scope:actor
							}
						}
					}
				}
				random_realm_county = {
					limit = {
						this != scope:recipient.capital_county
						any_neighboring_county = {
							any_county_province = {
								geographical_region = world_persian_empire
							}
							holder.top_liege != prev.holder.top_liege
						}
						NOR = {
							holder = scope:actor
							holder = {
								is_vassal_or_below_of = scope:actor
							}
						}
					}
					save_scope_as = invasion_target_title
				}
			}
			else_if = {
				limit = {
					any_realm_county = {
						this != scope:recipient.capital_county
						NOR = {
							holder = scope:actor
							holder = {
								is_vassal_or_below_of = scope:actor
							}
						}
					}
				}
				random_realm_county = {
					limit = {
						this != scope:recipient.capital_county
						NOR = {
							holder = scope:actor
							holder = {
								is_vassal_or_below_of = scope:actor
							}
						}
					}
					save_scope_as = invasion_target_title
				}
			}
			else_if = {
				limit = {
					any_realm_county = {
						NOR = {
							holder = scope:actor
							holder = {
								is_vassal_or_below_of = scope:actor
							}
						}
					}
				}
				random_realm_county = {
					limit = {
						NOR = {
							holder = scope:actor
							holder = {
								is_vassal_or_below_of = scope:actor
							}
						}
					}
					save_scope_as = invasion_target_title
				}
			}
			else = {
				random_realm_county = {
					save_scope_as = invasion_target_title
				}
			}
		}
		scope:invasion_target_title.duchy = {
			save_scope_as = text_title
		}
		hidden_effect = {
			add_opinion = {
				modifier = fp3_incited_conflict
				target = scope:actor
			}
			add_opinion = {
				modifier = declared_war
				target = scope:secondary_recipient
			}
		}
	}
	scope:secondary_recipient = {
		add_gold = {
			value = {
				value = scope:secondary_recipient.max_military_strength
				divide = 20
				round = yes
			}
			add = {
				if = {
					limit = {
						scope:financial_support = yes
					}
					add = fp3_request_invasion_troop_value_estimate
				}
			}
			if = {
				limit = {
					scope:recipient = {
						has_title = title:d_sunni
					}
					struggle:persian_struggle = {
						has_struggle_phase_parameter = cheaper_incursions_vs_caliph
					}
				}
				divide = 2
			}
		}
		start_war = {
			casus_belli = fp3_turkic_invasion_cb
			target = scope:recipient
			target_title = scope:invasion_target_title.duchy
		}
		custom_tooltip = fp3_turkic_invasion_cb_result_tt
		if = {
			limit = {
				scope:financial_support = yes
			}
			trigger_event = fp3_misc_decisions.0006
			if = {
				limit = {
					has_mpo_dlc_trigger = yes
				}
				show_as_tooltip = {
					spawn_army = {
						men_at_arms = {
							type = horse_archers
							stacks = fp3_request_invasion_troop_value_bonus_troops
						}
						men_at_arms = {
							type = steppe_raiders
							stacks = fp3_request_invasion_troop_value_bonus_troops
						}
						men_at_arms = {
							type = light_horsemen
							stacks = fp3_request_invasion_troop_value_bonus_troops
						}
						men_at_arms = {
							type = nomadic_riders
							stacks = fp3_request_invasion_troop_value_bonus_levy_nomads
						}
						location = capital_province
						uses_supply = yes
						inheritable = no
						name = turkic_tribal_event_troops
					}
				}
			}
			else = {
				show_as_tooltip = {
					spawn_army = {
						men_at_arms 
# … (cut here; the rest is in the file)

As written in game/common/character_interactions/00_fp3_interactions.txt.