Cain

Adam fell, with Eve, and then they had multiple children, one of which was Cain and another of which was Able and both had received their C&E and come to know God and talk with Him freely. Then Cain decided that he didn’t like to deal with persuading and letting people have agency and all the principles of righteousness by which God maintains His power and influence. And Cain wanting to rule over Satan and dominate the earth decided to leave all the truths taught by the Holy Ghost and killed Able to get gain and begin his dark reign. As a result, he was given the curse of outer darkness in which his skin turned black symbolic of his inner darkness. All this happened after the initial 7 day spiritual creation, and after the initial physical creation, and after Adam and Eve were driven from the Garden of Eden, and possibly even a few hundred years later.