coronation_create_artifact_yearly_effect

coronation_create_artifact_yearly_effect = {
	save_scope_as = owner
	if = {
		limit = {
			highest_held_title_tier >= tier_empire
			realm_size >= 120
		}
		set_artifact_rarity_famed = yes
	}
	else = {
		set_artifact_rarity_masterwork = yes
	}

	if = {
		limit = {
			coronation_proper_artifact_crown_trigger = yes
		}
		save_scope_value_as = {
			name = artifact_type
			value = flag:crown
		}
	}
	else_if = {
		limit = {
			coronation_proper_artifact_regalia_trigger = yes
		}
		save_scope_value_as = {
			name = artifact_type
			value = flag:regalia
		}
	}
	else = {
		random_list = {
			1 = {
				save_scope_value_as = {
					name = artifact_type
					value = flag:crown
				}
			}
			1 = {
				save_scope_value_as = {
					name = artifact_type
					value = flag:regalia
				}
			}
		}
	}
	if = {
		limit = {
			scope:artifact_type = flag:crown
		}
		create_artifact = {
			name = ach_yearly_crown_name
			description = ach_yearly_crown_desc
			type = helmet
			visuals = crown
			wealth = scope:wealth
			template = crown_wearable_template
			quality = scope:quality
			decaying = no
			modifier = artifact_parochial_vassal_opinion_3_modifier
			creator = scope:owner
			save_scope_as = newly_created_artifact
		}
		hidden_effect_new_object = {
			scope:newly_created_artifact = {
				add_scaled_artifact_modifier_rulership_effect = yes
			}
		}
	}
	else_if = {
		limit = {
			scope:artifact_type = flag:regalia
		}
		create_artifact = {
			name = ach_yearly_regalia_name
			description = ach_yearly_regalia_desc
			type = regalia
			template = regalia_template
			visuals = regalia
			wealth = scope:wealth
			quality = scope:quality
			decaying = no
			modifier = artifact_parochial_vassal_opinion_3_modifier
			creator = scope:owner
			save_scope_as = newly_created_artifact
		}
		hidden_effect_new_object = {
			scope:newly_created_artifact = {
				add_scaled_artifact_modifier_rulership_effect = yes
			}
		}
	}
}

As written in game/common/scripted_effects/10_ach_effects.txt.