coronation_change_law_effect

coronation_change_law_effect = {
	if = {
		limit = {
			involved_activity = {
				has_activity_option = {
					category = special_type
					option = coronation_type_anointment
				}
			}
		}
		if = {
			limit = {
				NOT = {
					has_game_rule = coronation_laws_off
				}
			}
			add_realm_law = crowned_emperor
		}
		set_variable = crowned_emperor_var
	}
	else = {
		if = {
			limit = {
				NOT = {
					has_game_rule = coronation_laws_off
				}
			}
			add_realm_law = crowned_king
		}
		set_variable = crowned_king_var
	}
}

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