create_cossack_scripted_effect

create_cossack_scripted_effect = {
	# Pseudo character to derive culture from without converting the founder by default
	create_character = {
		location = root.location
		culture = root.culture
		faith = root.faith
		rite = root.rite
		gender = root
		dynasty = none
		random_traits = no
		save_scope_as = cossack
	}
	## We make all nomad holdings tribal, or the government change won't work
	custom_tooltip = {
		every_sub_realm_county = {
			limit = {
				title_province = {
					OR = {
						has_holding_type = nomad_holding
						has_holding_type = herder_holding
					}
				}
			}
			## Add_to_list = holding_conversion
			title_province = {
				set_holding_type = tribal_holding
			}
		}
		text = create_cossack_tribal_tooltip
	}
	change_government = tribal_government

	## Create the Cossack Culture ##
	culture = { save_scope_as = founder_culture }
	every_player = {
		add_character_flag = {
			flag = hide_hybridization_event
			days = 1
		}
	}
	custom_tooltip = {
		text = cossack_custom_culture_hybrid
		scope:cossack = { create_hybrid_culture = culture:kazak }
	}
	scope:new_culture ?= {
		set_culture_name = {
			noun = cossack
			collective_noun = cossack_prefix
			prefix = cossack_collective_noun
		}
	}
	create_title_and_vassal_change = {
		type = created
		save_scope_as = title_change
		add_claim_on_loss = no
	}
	title:k_cossack = {
		change_title_holder = {
			holder = root
			change = scope:title_change
		}
	}
	resolve_title_and_vassal_change = scope:title_change

	## Set up the Cossack Kingdom title with de jure duchies
	custom_tooltip = {
		text = cossack_custom_de_jure
		title:k_cossack = { set_de_jure_liege_title = title:e_caspian-pontic_steppe }
		title:d_tana = { set_de_jure_liege_title = title:k_cossack }
		title:d_red_levedia = { set_de_jure_liege_title = title:k_cossack }
		title:d_levedia = { set_de_jure_liege_title = title:k_cossack }
		title:d_don_valley = { set_de_jure_liege_title = title:k_cossack }
		title:d_itil = { set_de_jure_liege_title = title:k_cossack }
	}

	##Add Cossack Culture to all de jure duchies in the Cossack Kingdom
	if = {
		limit = { exists = scope:new_culture }
		custom_tooltip = {
			text = cossack_custom_county_culture
			every_held_county = {
				limit = { kingdom = title:k_cossack }
				## Convert all the counties to Cossack Culture ##
				set_county_culture = scope:new_culture
			}
		}
	}
	else = { custom_tooltip = cossack_custom_county_culture_fallback }

	hidden_effect = {
		scope:cossack ?= { silent_disappearance_effect = yes }
	}
}

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