What are the requirements for Call Dynasty Member To War in CK3?

The character you target: Their government is not unplayable. (patch 1.20.1.2)

How do I get the AI to accept Call Dynasty Member To War?

Accepted automatically in some cases; otherwise the AI weighs it. Its reasons: Won't partake in meaningless conflict -1,000, Will not fight Heir -1,000, Will not fight Spouse -1,000, Already at War -50, … Opinion of …, Defensive War +50, Zeal against Infidels, Attack on Ally -50, War on another Ally -25, Attack on Religious Brethren -50 and Opposing Struggle Side -100.

Interaction · Diplomatic actions

Call Dynasty Member To War

No costAccepted automatically in some cases; otherwise the AI weighs it

Call the recipient to serve their Dynasty in war

What you need

You

To send it

Your dynasty:
- dynasty_prestige >= medium_dynasty_prestige_value
The target: Is war leader in the war against you
If
- The target: Has you as the war's attacker
Then
- The target:
  primary_defender = { save_temporary_scope_as = primary_enemy }
Otherwise
- The target:
  primary_attacker = { save_temporary_scope_as = primary_enemy }

To see it in the menu

The target is not you
Any character war: Is war leader in the war against you
Is a Dynasty Head
Your religion is the same as that of recipient
Is of the same dynasty as the target
house != scope:recipient.house

The character you target

To send it

Their government is not unplayable

To see it in the menu

Is a ruler
Is not a vassal (or below) of you

Call Dynasty Member To War is a diplomatic character interaction in Crusader Kings III. The character you target needs: Their government is not unplayable. Accepted automatically in some cases; otherwise the AI weighs it. Reasons the AI weighs include Won't partake in meaningless conflict (-1,000), Will not fight Heir (-1,000), Will not fight Spouse (-1,000) and 6 more. Patch 1.20.1.2, from game/common/character_interactions/00_dynast_interactions.txt.

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Quick answers (2)

What are the requirements for Call Dynasty Member To War in CK3?: The character you target: Their government is not unplayable. (patch 1.20.1.2)
How do I get the AI to accept Call Dynasty Member To War?: Accepted automatically in some cases; otherwise the AI weighs it. Its reasons: Won't partake in meaningless conflict -1,000, Will not fight Heir -1,000, Will not fight Spouse -1,000, Already at War -50, … Opinion of …, Defensive War +50, Zeal against Infidels, Attack on Ally -50, War on another Ally -25, Attack on Religious Brethren -50 and Opposing Struggle Side -100.

Will they accept?

Accepted automatically when:

They use their Hook on …

Otherwise the AI adds these up and accepts above zero. Reasons in italics are the script's, with no label in the game.

Reason	Amount
Base	+20
Won't partake in meaningless conflict when If a check the game hides Then The target: The war’s casus belli is Border Raid The character you target: Does not have the Trait: Raider Does not have the Trait: Pillager Otherwise Never	-1,000
Will not fight Heir when If `scope:target.casus_belli.primary_defender = scope:puppet_or_actor` Then `scope:target.casus_belli.primary_attacker = scope:recipient.player_heir` Otherwise `scope:target.casus_belli.primary_defender = scope:recipient.player_heir`	-1,000
Will not fight Spouse when The character you target: If `scope:target.casus_belli.primary_defender = scope:puppet_or_actor` Then Any spouse: Otherwise Any spouse:	-1,000
Already at War when The character you target: Is at War	-50
… Opinion of …	varies
Their personality (AI values: honor 1)	varies
Defensive War when `scope:target.casus_belli.primary_defender = scope:puppet_or_actor`	+50
Zeal against Infidels when The target’s faith is your One of these The target’s casus belli’s primary attacker: Is you Their faith: `faith_hostility_level = { target = scope:target.casus_belli.primary_defender.faith value >= religious_cb_enabled_hostility_level }` or The target’s casus belli’s primary defender: Is you Their faith: `faith_hostility_level = { target = scope:target.casus_belli.primary_attacker.faith value >= religious_cb_enabled_hostility_level }` `min = 0`	ai_zeal
Attack on Ally when `scope:target.casus_belli.primary_attacker = scope:puppet_or_actor` The character you target: `is_allied_to = scope:target.casus_belli.primary_defender`	-50
War on another Ally when `scope:target.casus_belli.primary_defender = scope:puppet_or_actor` The character you target: `is_allied_to = scope:target.casus_belli.primary_attacker`	-25
Attack on Religious Brethren when The target’s faith is not your `scope:target.casus_belli.primary_attacker = scope:puppet_or_actor` `scope:target.casus_belli.primary_defender.faith = scope:recipient.faith` The target’s casus belli’s war: One of these The war’s casus belli is Minor Holy or The war’s casus belli is Holy or The war’s casus belli is Major Holy or The war’s casus belli is Great Holy War or The war’s casus belli is Great Holy War	-50
Opposing Struggle Side when One of these All of these You: Has the Trait: Detractor of the Caliphate The character you target: Has the Trait: Supporter of Caliphal Authority or All of these You: Has the Trait: Supporter of Caliphal Authority The character you target: Has the Trait: Detractor of the Caliphate	-100

Acceptance (ai_accept) (144 lines of game script)

base = 20
modifier = {
	add = -1000
	desc = WONT_FIGHT_MEANINGLESS_REASON
	trigger_if = {
		limit = {
			exists = scope:target
		}
		scope:target = {
			using_cb = fp2_border_raid
		}
		scope:recipient = {
			NOR = {
				has_trait = viking
				has_trait = reaver
			}
		}
	}
	trigger_else = {
		always = no
	}
}
modifier = {
	add = -1000
	exists = scope:recipient.player_heir
	trigger_if = {
		limit = {
			scope:target.casus_belli.primary_defender = scope:puppet_or_actor
		}
		scope:target.casus_belli.primary_attacker = scope:recipient.player_heir
	}
	trigger_else = {
		scope:target.casus_belli.primary_defender = scope:recipient.player_heir
	}
	desc = WONT_FIGHT_HEIR_REASON
}
modifier = {
	add = -1000
	scope:recipient = {
		trigger_if = {
			limit = {
				scope:target.casus_belli.primary_defender = scope:puppet_or_actor
			}
			any_spouse = {
				this = scope:target.casus_belli.primary_attacker
			}
		}
		trigger_else = {
			any_spouse = {
				this = scope:target.casus_belli.primary_defender
			}
		}
	}
	desc = WONT_FIGHT_SPOUSE_REASON
}
modifier = {
	add = -50
	scope:recipient = {
		is_at_war = yes
	}
	desc = ALREADY_AT_WAR
}
opinion_modifier = {
	who = scope:recipient
	opinion_target = scope:puppet_or_actor
	multiplier = 1.0
	desc = AI_OPINION_REASON
}
ai_value_modifier = {
	ai_honor = 1
	min = 0
}
modifier = {
	add = 50
	scope:target.casus_belli.primary_defender = scope:puppet_or_actor
	desc = DEFENSIVE_WAR_REASON
}
compare_modifier = {
	trigger = {
		scope:recipient.faith = scope:puppet_or_actor.faith
		OR = {
			AND = {
				scope:target.casus_belli.primary_attacker = {
					this = scope:puppet_or_actor
					faith = {
						faith_hostility_level = {
							target = scope:target.casus_belli.primary_defender.faith
							value >= religious_cb_enabled_hostility_level
						}
					}
				}
			}
			AND = {
				scope:target.casus_belli.primary_defender = {
					this = scope:puppet_or_actor
					faith = {
						faith_hostility_level = {
							target = scope:target.casus_belli.primary_attacker.faith
							value >= religious_cb_enabled_hostility_level
						}
					}
				}
			}
		}
	}
	target = scope:recipient
	value = ai_zeal
	desc = ZEAL_AGAINST_INFIDELS
	min = 0
	multiplier = 0.5
}
modifier = {
	add = -50
	scope:target.casus_belli.primary_attacker = scope:puppet_or_actor
	scope:recipient = {
		is_allied_to = scope:target.casus_belli.primary_defender
	}
	desc = ATTACK_ON_ALLY_REASON
}
modifier = {
	add = -25
	scope:target.casus_belli.primary_defender = scope:puppet_or_actor
	scope:recipient = {
		is_allied_to = scope:target.casus_belli.primary_attacker
	}
	desc = WAR_WITH_ALLY_REASON
}
modifier = {
	add = -50
	scope:recipient.faith != scope:puppet_or_actor.faith
	scope:target.casus_belli.primary_attacker = scope:puppet_or_actor
	scope:target.casus_belli.primary_defender.faith = scope:recipient.faith
	scope:target.casus_belli.war = {
		OR = {
			using_cb = minor_religious_war
			using_cb = religious_war
			using_cb = major_religious_war
			using_cb = undirected_great_holy_war
			using_cb = directed_great_holy_war
		}
	}
	desc = WONT_ATTACK_RELIGIOUS_BRETHREN_REASON
}
fp3_struggle_resist_allied_wars_modifier = yes

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

What happens

If they accept

If
a check the game hides
Then
- The target:
  If
  is_attacker = scope:puppet_or_actor
  Then
  add_attacker = scope:recipient
  Otherwise
  add_defender = scope:recipient
- Your dynasty: The dynasty gains … Renown
If never › You: Use a Hook on the target
If
a check the game hides
Then
- You: Event call_ally.0100

When it is accepted automatically

The character you target: Event call_ally.0001

If they refuse

If
a check the game hides
Then
- The target:
  If
  is_attacker = scope:puppet_or_actor
  Then
  You: Opinion: Rejected Call to an Offensive War
  Otherwise
  You: Opinion: Rejected Call to a Defensive War
- Your dynasty: The dynasty gains … Renown
If
a check the game hides
Then
- You: Event call_ally.0101

Options when sending

Use a Hook

Events it fires: call_ally.0100, call_ally.0101, call_ally.0001

• the game's own tooltip text · ◦ our reading of the script line · code the script where neither exists

Who can use it and sees it (is_available, is_shown) (18 lines of game script)

is_shown = scope:recipient != scope:puppet_or_actor
scope:puppet_or_actor ?= {
	any_character_war = {
		is_war_leader = scope:puppet_or_actor
	}
	is_dynast = yes
	religion ?= scope:recipient.religion
	dynasty ?= scope:recipient.dynasty
	house != scope:recipient.house
}
scope:recipient = {
	is_ruler = yes
}
scope:recipient = {
	NOT = {
		target_is_liege_or_above = scope:puppet_or_actor
	}
}

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

Can be sent when (is_valid…) (26 lines of game script)

scope:puppet_or_actor.dynasty = {
	dynasty_prestige >= medium_dynasty_prestige_value
}
scope:recipient = {
	NOT = {
		government_has_flag = government_is_mercenary
	}
	NOT = {
		government_has_flag = government_is_holy_order
	}
}
custom_description = {
	text = is_already_in_all_wars
	scope:puppet_or_actor = {
		any_character_war = {
			NOR = {
				is_participant = scope:recipient
				was_called = scope:recipient
			}
			OR = {
				primary_attacker = scope:puppet_or_actor
				primary_defender = scope:puppet_or_actor
			}
		}
	}
}

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

Effects (on_send, on_accept, on_decline) (63 lines of game script)

on_accept = call_dynasty_member_to_war_interaction_effect = yes
save_scope_value_as = {
	name = call_dynasty_member_to_war_interaction
	value = yes
}
if = {
	limit = {
		exists = scope:target
	}
	scope:puppet_or_actor = {
		trigger_event = call_ally.0100
	}
}
on_decline = if = {
	limit = {
		exists = scope:target
	}
	scope:target = {
		if = {
			limit = {
				is_attacker = scope:puppet_or_actor
			}
			scope:puppet_or_actor = {
				add_opinion = {
					modifier = rejected_call_to_offensive_war
					target = scope:recipient
				}
			}
		}
		else = {
			scope:puppet_or_actor = {
				add_opinion = {
					modifier = rejected_call_to_defensive_war
					target = scope:recipient
				}
			}
		}
		hidden_effect = {
			if = {
				limit = {
					NOT = {
						was_called = scope:recipient
					}
				}
				set_called_to = scope:recipient
			}
		}
	}
	scope:puppet_or_actor.dynasty = {
		add_dynasty_prestige = medium_dynasty_prestige_loss
	}
}
if = {
	limit = {
		exists = scope:target
	}
	scope:puppet_or_actor = {
		trigger_event = call_ally.0101
	}
}
on_auto_accept = scope:recipient = {
	trigger_event = call_ally.0001
}

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

Category: Diplomatic actions
In the menu: under More…
ID: call_dynasty_member_to_war_interaction

Source: game/common/character_interactions/00_dynast_interactions.txt and the English localisation, Crusader Kings III 1.20.1.2. “You” is the character who sends it (scope:actor, or a puppet acting for you); “the character you target” is the recipient.