RWBY

From the introduction:

Legends.

Stories scattered through time. Mankind has grown quite fond of recounting the exploits of heroes and villains, forgetting so easily that we are remnants, byproducts, of a forgotten past.

Man, born from dust, was strong, wise and resourceful. But he was born into an unforgiving world. An inevitable darkness, creatures of destruction. The creatures of Grimm set their sights on man and all of his creations. These forces clashed, and it seemed the darkness was intent on returning man’s brief existence into the void.