Red Poison

According to Naofumi and Fitoria, it appears to cause beneficial and adverse effects, depending on who drinks it. According to both Fitoria and Ethnobalt, humans must never drink this substance. Fitoria claims that a human even drinking a drop of the Red Poison causes extremely detrimental effects. She states that one drop of the poison will cause eternal pain, a second drop will result in unending loneliness, and a third drop "means something truly terrible." Ethnobalt warns Naofumi that a human ingesting a dose of this substance will result in immediate death. From this information, Naofumi concludes that the Red Poison is created only for monsters to drink.