Potion Explosion: The Fifth Ingredient At the Horribilorum Sorcery Academy for Witty Witches and Wizards, we are not afraid of ghosts! Potion Explosion: The Fifth Ingredient introduces a new spooky ingredient: Ghost Ectoplasm! But don’t panic as the new Professors will teach you how to handle it safely and use it to brew powerful new potions! This expansion for Potion Explosion steps up the