call_ally_interaction_event_effect

call_ally_interaction_event_effect = {
	if = {
		limit = {
			OR = {
				scope:actor = {
					any_home_court_hostage = {
						warden ?= { is_attacker_in_war = scope:target }
					}
				}
				scope:target = {
					any_war_attacker = {
						any_warden_hostage = { home_court ?= scope:actor }
					}
				}
			}
		}
		custom_tooltip = hostage_execution_warning_tt
	}
	scope:target = {
		hidden_effect = {
			set_called_to = scope:recipient
		}
		if = {
			limit = {
				is_attacker = scope:actor
			}
			add_attacker = scope:recipient
			scope:actor = {
				#Check for Mandala first
				if = {
					limit = {
						government_has_flag = government_is_mandala
						scope:recipient = { is_tributary_of = scope:actor }
					}
					if = {
						limit = {
							scope:recipient.primary_title.tier = tier_barony
						}
						add_piety = {
							add = minor_piety_loss
							multiply = 2
						}
					}
					else_if = {
						limit = {
							scope:recipient.primary_title.tier = tier_county
						}
						add_piety = {
							add = medium_piety_loss
							multiply = 2
						}
					}
					else_if = {
						limit = {
							scope:recipient.primary_title.tier = tier_duchy
						}
						add_piety = {
							add = major_piety_loss
							multiply = 2
						}
					}
					else_if = {
						limit = {
							scope:recipient.primary_title.tier = tier_kingdom
						}
						add_piety = {
							add = massive_piety_loss
							multiply = 1.5
						}
					}
					else_if = {
						limit = {
							scope:recipient.primary_title.tier = tier_empire
						}
						add_piety = {
							add = monumental_piety_loss
							multiply = 1.5
						}
					}
					else_if = {
						limit = {
							scope:recipient.primary_title.tier = tier_hegemony
						}
						add_piety = {
							add = monumental_piety_loss
							multiply = 2.5
						}
					}
				}
				#Then do everything else
				else = {
					if = {
						limit = {
							NOT = {
								has_relation_blood_brother = scope:recipient
							}
						}
						if = { # PAM - Peace of God PT discount
							limit = {
								scope:actor = {
									faith = scope:recipient.faith
									has_personal_tenet_flag = tenet_peace_of_god_cheaper_ally_call
									faith = {
										faith_hostility_level = {
											target = scope:target.primary_defender.faith
											value >= faith_hostile_level
										}
									}
								}
							}
							pam_peace_of_god_personal_tenet_cheaper_alliance_call_effect = yes
						}
						else = {
							add_prestige = {
								value = 0
								subtract = scope:recipient.tier_scaled_prestige_value
							}
						}
					}
				}

As written in game/common/scripted_effects/00_interaction_effects.txt.