They are siblings and they are scent possessors as they can kill someone by using the scent they make, or they can make someone have a headache, throw up a nosebleed and etc, they were just scent magic from one of mama cows' scent destroyers to remove anything smelly until one day it fell onto two of mama cows dead fish which she was trying to save and it spilled on them and bring them back to life and they were known as the scent possessors on the many fights and battles they've been in!