give_witch_secret_or_trait_effect

give_witch_secret_or_trait_effect = {
	save_temporary_scope_as = witch_character
	if = {
		limit = { #Not already a witch
			is_witch_trigger = no
		}
		if = {
			limit = {
				is_available_quick = { advanced_ruler = yes }
				NOT = { knows_doctrine = doctrine_witchcraft_accepted }
			}
			add_known_doctrine = doctrine_witchcraft_accepted
		}
		if = {
			limit = {
				trait_is_shunned_or_criminal_in_my_or_lieges_rite_trigger = { TRAIT = trait:witch GENDER_CHARACTER = scope:witch_character }
			}
			add_secret = {
				type = secret_witch
			}
			shunned_or_criminal_sf_impact_effect = { TRAIT = trait:witch }
			random_secret = {
				type = secret_witch
				save_scope_as = witch_secret
			}
			# If you have a legend maybe we change it?
			if = {
				limit = {
					has_legend_chapter_trigger = { CHAPTER = opening }
				}
				random = {
					chance = 10
					send_interface_toast = {
						title = legend_chapter_change_toast
						left_icon = root
						promoted_legend = {
							set_legend_chapter = {
								name = opening
								localization_key = legend_chapter_opening_witch
							}
						}
					}
				}
			}
		}
		else = {
			add_trait = witch
			# If you have a legend maybe we change it?
			if = {
				limit = {
					has_legend_chapter_trigger = { CHAPTER = opening }
				}
				random = {
					chance = 10
					send_interface_toast = {
						title = legend_chapter_change_toast
						left_icon = root
						promoted_legend = {
							set_legend_chapter = {
								name = opening
								localization_key = legend_chapter_opening_witch
							}
						}
					}
				}
			}
		}
	}
}

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