The pesky enemies are completely invincible to any of the Link's attacks. They will slowly pursue Link and will do 1/2 a heart of damage if they contact him. If Link swipes at a Shell Beast, it will be knocked back, but will then keep on coming. These relentless enemies have a single weakness and it is the environment they choose to occupy. They are always found near a ledge and if Link knocks them off a ledge, they will tumble into the abyss.