hunter_progress_point_gain_effect

hunter_progress_point_gain_effect = {
	if = {
		limit = { is_alive = yes }
		if = {
			limit = {
				NOT = { exists = var:hunter_lifestyle_progress }
			}
			set_variable = {
				name = hunter_lifestyle_progress
				value = $CHANGE$
			}
		}
		else = {
			change_variable = {
				name = hunter_lifestyle_progress
				add = $CHANGE$
			}
		}
		save_scope_value_as = {
			name = hunt_base_increase
			value = $CHANGE$
		}
		# Tooltips
		if = {
			limit = { scope:hunt_base_increase <= 1 }
			custom_tooltip = hunt_progress_towards_trait_1_tt
		}
		else_if = {
			limit = { scope:hunt_base_increase = 2 }
			custom_tooltip = hunt_progress_towards_trait_2_tt
		}
		else = { custom_tooltip = hunt_progress_towards_trait_3_tt }
		#Random chance of additional point to increase unpredictability
		hidden_effect = {
			random = {
				chance = 50
				change_variable = {
					name = hunter_lifestyle_progress
					add = $RANDOM_CHANGE$
				}
			}
		}
		#Extra Random chance with the Hunters Tradition
		if = {
			limit = { 
				culture = { has_cultural_parameter = hunting_traits_more_common }
				involved_activity = {
					NOT = {
						has_activity_option = { category = special_type option = hunt_type_falconry }
					}
				}
			} 
			random = {
				chance = 75
				change_variable = {
					name = hunter_lifestyle_progress
					add = 1
				}
			}
		}
		else_if = {
			limit = { 
				culture = { has_cultural_parameter = falconer_traits_more_common }
				involved_activity = {
					has_activity_option = { category = special_type option = hunt_type_falconry }
				}
			} 
			random = {
				chance = 75
				change_variable = {
					name = hunter_lifestyle_progress
					add = 1
				}
			}
		}
	}
}

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