Chapter 1: Shen Tooth

Two thousand years ago, humans and non-humans had a bloody war where more than half of the human population was killed, and millions of non-humans went extinct. The pixies managed to turn the king of all humans to stone, and the humans banished the non-human to the islands around Antarctica. The Hydra serves to keep the non-human in and the humans out. This has worked out for about 2,000 years until one lucky human finds a way.