Primordial God's, literally means "first born" and are a group of Aspect's born in the begining of our universe.
The Primdial Four are the first entities or beings that came into existence. they form the very fabric of our universe and as such are immortal. the Four are a group of aspects from which all the other god's and beings originated from. Although generally believed to be the first gods produced from Creator's sacriface, some sources mention a pair of Forerunners who are the parents of all lesser beings. These Deities represents genisis and the 5th element.