Offer of Peace

is_available = trigger_if = {
	limit = {
		is_ai = yes
	}
	is_at_war = yes
	any_character_war = {
		is_war_leader = root
		OR = {
			defender_war_score >= 100
			AND = {
				primary_defender ?= {
					is_ai = yes
				}
				OR = {
					attacker_war_score >= 90
					AND = {
						root = {
							dynasty ?= {
								has_dynasty_perk = mpo_nomad_legacy_3
							}
						}
						attacker_war_score >= 80
					}
				}
				root = {
					has_perk = peacemaker_perk
				}
			}
			AND = {
				primary_defender ?= {
					is_ai = yes
				}
				root = {
					dynasty ?= {
						has_dynasty_perk = mpo_nomad_legacy_3
					}
				}
				OR = {
					attacker_war_score >= 90
					AND = {
						root = {
							has_perk = peacemaker_perk
						}
						attacker_war_score >= 80
					}
				}
			}
			AND = {
				primary_attacker ?= {
					save_temporary_scope_as = attacker
					is_ai = yes
				}
				defender_war_score >= 70
				root = {
					has_variable = peace_acceptance_head_scare
					var:peace_acceptance_head_scare ?= {
						this = scope:attacker
					}
				}
			}
		}
	}
}

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

scope:war ?= {
	has_valid_casus_belli = yes
}

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

on_accept = scope:war ?= {
	casus_belli = {
		primary_attacker = {
			save_scope_as = attacker_loser
		}
		primary_defender = {
			save_scope_as = defender_winner
			set_signature_weapon_effect = yes
		}
	}
	if = {
		limit = {
			NOT = {
				using_cb = fp3_free_house_member_cb
			}
		}
		release_prisoners_of_war_effect = yes
	}
}
if = {
	limit = {
		scope:war ?= {
			NOR = {
				using_cb = undirected_great_holy_war
				using_cb = directed_great_holy_war
			}
			bp2_hostage_exchange_invalid_cb_trigger = no
		}
	}
	if = {
		limit = {
			exists = scope:secondary_actor
			scope:recipient = {
				is_landed = yes
			}
		}
		hostage_depart_effect = {
			HOSTAGE = scope:secondary_actor
			WARDEN = scope:recipient
			HOME_COURT = scope:actor
		}
	}
	if = {
		limit = {
			exists = scope:secondary_recipient
			scope:actor = {
				is_landed = yes
			}
		}
		hostage_depart_effect = {
			HOSTAGE = scope:secondary_recipient
			WARDEN = scope:actor
			HOME_COURT = scope:recipient
		}
	}
}
hidden_effect = {
	scope:attacker_loser = {
		if = {
			limit = {
				any_vassal = {
					this != scope:defender_winner
				}
			}
			every_vassal = {
				limit = {
					this != scope:defender_winner
				}
				send_interface_toast = {
					type = msg_liege_war_ended_defender_win
					title = war_event.notification_liege_loss.t
					left_icon = scope:attacker_loser
					right_icon = scope:defender_winner
					custom_tooltip = war_event.1905
				}
			}
		}
	}
	scope:defender_winner = {
		if = {
			limit = {
				any_vassal = {
					this != scope:attacker_loser
				}
			}
			every_vassal = {
				limit = {
					this != scope:attacker_loser
				}
				send_interface_toast = {
					type = msg_liege_war_ended_defender_win
					title = war_event.notification_liege_win.t
					left_icon = scope:defender_winner
					right_icon = scope:attacker_loser
					custom_tooltip = war_event.1906
				}
			}
		}
	}
}
scope:war ?= {
	end_war = defender
}
on_decline = 

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