bp1_yearly_9026_determine_sin_and_virtue

bp1_yearly_9026_determine_sin_and_virtue = {
	if = {
		limit = {
			OR = {
				has_trait = greedy
				has_trait = gluttonous
				has_trait = chaste
			}
		}
		random_owned_story = {
			type = story_being_visited_by_angry_ghosts
			set_variable = {
				name = trait_to_gain
				value = 1 #generous
			}
		}
	}
	else_if = {
		limit = {
			OR = {
				has_trait = murderer
				any_secret = {
					type = secret_murder
				}
				has_trait = wrathful
				has_trait = vengeful
			}
		}
		random_owned_story = {
			type = story_being_visited_by_angry_ghosts
			set_variable = {
				name = trait_to_gain
				value = 2 # forgiving
			}
		}
	}
	else = {
		random_owned_story = {
			type = story_being_visited_by_angry_ghosts
			set_variable = {
				name = trait_to_gain
				value = 3 #compassionate
			}
		}
	}
}

As written in game/common/scripted_effects/03_bp1_haunted_by_ghosts_effects.txt.