The god of darkness
Erebus is a primeval god and a personification.
Erebus is said to be "the embodiment of primordial darkness," (Encyclopedia Mythica). This could mean that he is the tangible and sentient form of darkness as opposed to the god of it. He is also described instead as a "personification of darkness." (EBSCO), indicating that he is not a god and is instead a thing as opposed to a being. Although it is not clarified which definition is correct, we can infer that all are used in different sub-units of greek mythology.
Erebus's name is also used for Hades, the infernal region below the Earth.
Erebus's fun family:
Erebus had a relationship with Nyx, who is the god of the night, and also came from Chaos. They had two children: Aether, the light of the upper atmosphere;and Hemera, the protogenos god of day.
"Erebus." Columbia Electronic Encyclopedia. 6th ed. N.p.: Columbia UP, 2013. 1. EBSCO Literary Reference Center. Web. 10 Nov. 2014. <http://web.a.ebscohost.com/ehost/detail/detail?vid=5&sid=2565a9a8-9fbf-4717-a774-17914975e657%40sessionmgr4002&hid=4104&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d#db=lfh&AN=39005236>.
"Erebus." Erebus. MCMXCV, 8 May 2000. Web. 10 Nov. 2014.
Jordan, Michael. Encyclopedia of Gods. N.p.: Facts on File, 1993. Print.