The giant green planet that is mother Earth houses various spacies and races of living things, none living things and the undead, neither living nor dead. Some of these species lives on land, the water bodies or the air, there are some that actually survive on all of the above.
That is according to humans classification of what is apparent to their eyes. In reality, the world is much more than just that.
A thick barrier divides the earth into an equal proportion forming the earth crust and the earth surface. The earth surface mainly the dwelling place of the humans, while the earth crust is known as the underworld. A medium only accessed through the barrier and the dwelling place of dead and the undead. It also houses all evil creatures and the roots of all magical beings or beings with a core instead of soul, or both.
Your gift is the motivation for my creation. Give me more motivation!