A RWBY x Biohazard (Resident Evil) Crossover!
For so many years Atlas has been supporting the Umbrella Corporations, only for marketing purposes. The technology built by Atlas aided Umbrella so much that they were able to conduct multiple tests on such as pharmaceuticals. Many of the experiments were quite a success, therefore Atlas has given Umbrella the chance to spread its vaccinations and other treatments to other parts of Remnant for a good use. However, without authorization of using the "C-Virus" samples, Umbrella secretly had a plan that dealt with genetics.
Due to immense amount of Grimm, they captured and performed tests on several creatures. Who knows what kind of monstrosities they'll create. Umbrella knew that they were being watched so they acted quickly before they were exposed for their crimes. They just released their first test subject through Atlas, a Beowolf that contained the "C-Virus". The Grimm had the ability to spread the Vi