RWBY World of Remnant Season 1 Episode 3 Grimm Episode Title:Grimm.Episode Description:The narrator details the creatures of Grimm as a destructive force that has existed throughout most of Remnant across known history. Once believed to be evil spirits, further study revealed they continued to evolve and diversify over time like animals. They attack humans and their creations first and foremost, only conflicting with wildlife for territory. Common belief is that Grimm do not need to feed; they choose to. They are drawn to negative emotions - with numbers proportionate to how far panic spreads. Captured Grimm usually break free or die quickly and their bodies evaporate shortly after their death, making study difficult. The narrator concludes that Grimm are not mindless; while younger ones are more reckless, older ones learn from their experiences to be more cautious in the future - a natural adaptation that makes them more effective killers.