Level up your RWBY: Grimm Eclipse is a co-op, hack-and-slash game for up to four players based upon Rooster Teeth’s international hit series RWBY. Join your friends in intense combat action as one of eight students of Beacon Academy and stop the evil forces of the Grimm and Doctor Merlot. Summary: RWBY: Grimm Eclipse is a co-op, hack-and-slash game for up to four players based upon Rooster Teeth’s international hit series RWBY.