The second most powerful aboriginal people were Earth Devils. They spent long periods of their lives residing thirty thousand meters under the surface.
The temperament of Earth Devils was completely opposite of Deus, who were completely indifferent to worldly matters and didn't desire to fight. Earth Devils were in love with conquest and invading other lands, but because of the innate restriction of their bloodline, they were unable to reside under the sun. Regardless of how much they desired to invade the Origin World, they could not do it.
Only darkness suited them. If they appeared under the sun, their strength would drop greatly. Those who were weak might even melt and turn into a puddle of a blood if they were exposed to the sunshine for a slightly longer period of time.