User blog comment:FinalWholockianGrrlGamer/Goofing off with headcanons: How everyone dies./@comment-3146930-20140125112607

Well, RWBY will be put in a situation where they are facing or about to face a strong enemy. In order to save her friends, Ruby will go on ahead and separate herself from the group with her speed. Anyway, she will fight the Big Bad(s), during which time she will be injured. As she is about to be killed, Yang will jump in front and be stabbed/shot instead. She will turn around and give Ruby a smile before falling to the ground, dead. Anyway, at that time Blake will bounce around to stall for time while Weiss aids Ruby. However Blake will eventually be killed when she tries to sneak up from behind, but ends up getting her head chopped off as the Big Bad spins around with his sword/scythe/bladed weapon. Then Ruby and Weiss will try to fight together, but be no match in the end. So Weiss will use the full extent of her glyphs to pull a self-destruct move and destroy everyone to save them all. Ruby will survive the blast, but then the Big Bad will appear behind her and break her neck.

As far as a Big Bad goes, I have a theory that Grimm are created by some kind of dormant intelligence; basically the first Grimm to come into existence and all Grimm were made from it. Anyway something happens that awakens it and the rest of the Hunters and high level warriors are busy fighting off Grimm to save the people. Team RWBY goes to stop the Big Bad, as it is controlling the Grimm attacking the city. However as they get closer and closer, Ruby realizes the danger and can't allow her team to be hurt so she separates herself from them, leading to my original theory.