The First:
A term describing various human groups who inhabit the cavern systems and re-established antediluvian cities beneath the North American continent. Many of these may be descended from early American colonists, while others are apparently descended from older civilizations such as ancient native Americans who went underground hundreds and/or thousands of years ago. The nemesis of the Tero are the 'dero', which apparently consist of draconian or reptilian controlled elements.
The Second:
Explains the Teros as an underground civilization as well, but refer to them as non-humans. The Teros are more friendly and help keep the Deros , who are more demented from having excessive power. They live in underground tunnels, cities and sometimes under the sea. Most of the legends of leprechauns and trolls derive from this species.
