hunt_activity_deer_game_effect

hunt_activity_deer_game_effect = {
	if = {
		limit = { NOT = { exists = scope:liege } }
		if = {
			limit = { exists = scope:story }
			scope:story.story_owner = { save_temporary_scope_as = liege }
		}
		else = {
			root = { save_temporary_scope_as = liege }
		}
	}
	random_list = {
		5 = { # Deer - Europe, Middle East, India, Steppe
			trigger = {
				$PROVINCE$ = { hunt_animal_deer_trigger = yes }
			}
			random_list = {
				4 = { # Roe - Small deer
					trigger = {
						$PROVINCE$ = { hunt_animal_roe_trigger = yes }
					}
					modifier = {
						add = -4
						exists = scope:big_local_game
					}
					set_variable = { name = animal_type value = flag:roe } # Roe
				}
				4 = { # Stag - Standard deer
					# Increase larger deer chance with management buildings
					hunt_activity_game_building_modifier = { PROVINCE = $PROVINCE$ }
					# Master of Hunt aptitude affects chance of managed game
					activity_court_position_aptitude_positive_modifier = { LIEGE = scope:liege POS = master_of_hunt }
					if = {
						limit = {
							$PROVINCE$ = {
								geographical_region = hunt_animal_reindeer_region
								OR = {
									terrain = taiga
									terrain = forest
								}
							}
						}
						set_variable = { name = animal_type value = flag:reindeer }
					}
					else = {
						set_variable = { name = animal_type value = flag:stag }
					}
				}
				2 = { # Hart - Prestigious deer
					trigger = {
						NOT = { exists = scope:small_local_game }
					}
					# Offset lack of Roe chance
					modifier = {
						factor = 0.5
						$PROVINCE$ = { hunt_animal_roe_trigger = yes }
					}
					# Increase larger deer chance with management buildings
					hunt_activity_game_building_modifier = { PROVINCE = $PROVINCE$ }
					# Master of Hunt aptitude affects chance of managed game
					activity_court_position_aptitude_positive_modifier = { LIEGE = scope:liege POS = master_of_hunt }
					if = {
						limit = {
							$PROVINCE$ = {
								geographical_region = hunt_animal_elk_region
								OR = {
									terrain = taiga
									terrain = forest
								}
							}
						}
						set_variable = { name = animal_type value = flag:elk }
					}
					else = {
						set_variable = { name = animal_type value = flag:hart }
					}
				}
			}
		}
		5 = { # Antelope - Africa, Middle East, India, Steppe
			trigger = {
				$PROVINCE$ = { hunt_animal_antelope_trigger = yes }
			}
			random_list = {
				4 = { # Gazelle - Small antelope
					trigger = {
						$PROVINCE$ = { hunt_animal_gazelle_trigger = yes }
					}
					modifier = {
						add = -4
						exists = scope:big_local_game
					}
					set_variable = { name = animal_type value = flag:gazelle }
				}
				4 = { # Antelope - Standard antelope
					# Increase larger deer chance with management buildings
					hunt_activity_game_building_modifier = { PROVINCE = $PROVINCE$ }
					# Master of Hunt aptitude affects chance of managed game
					activity_court_position_aptitude_positive_modifier = { LIEGE = scope:liege POS = master_of_hunt }
					if = {
						limit = {
							$PROVINCE$ = { hunt_animal_steppe_trigger = yes }
						}
						set_variable = { name = animal_type value = flag:saiga }
					}
					else = {
						set_variable = { name = animal_type value = flag:antelope }
					}
				}
			}
		}
	}
	# Fallback
	if = {
		limit = { NOT = { exists = var:animal_type } }
		set_variable = { name = animal_type value = flag:stag years = 3 }
	}
}

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