Once Upon a Time, in a world known as Remnant, mankind became the target of the ' Creatures of Grimm': malevolent creatures that are attracted to negative emotions and who emerged from the darkness to attack humanity for reasons unknown. It is also Rooster Teeth's first original IP and has since expanded into a multi-media franchise. RWBY (pronounced 'Ruby') is an Animesque CGI animated series created by Monty Oum and produced by Rooster Teeth.