The Enesserrette is a group in DEXTER. The Enesserrette are an Early A.D. Cult that studied the Book of Revelation, written by author John the Revelator. They believed that the text contained a Code that could trigger the End of Days and thus encrypted it, until one Professor James Gellar was able to decipher it while entering various notes within a journal of his.
According to his notes, seven sacrifices would be required to trigger the end of the world and Gellar depicted each of them in what would later be known as the Doomsday Tableaus. Former-student Travis Marshall found out about these notes and began enacting each of the requirements by killing people just as stated within the code.