Players are never too old to go back to class, and with all of the new magical discoveries being made, now is a perfect time to round out their education. Potion Explosion: The Fifth Ingredient introduces Ghost Ectoplasm to the classroom. It works as a wild ingredient for completing potions and creating explosions. This expansion also includes new potions, Reward and Scolding tokens, and the mysterious Ghastly Cauldron. This is an expansion. The Potion Explosion core game is required to play.