Enigma, The Shadow Backstory

A woman of little mercy, Enigma is just as her name suggests. She is a mystery to even the gods, who fail to comprehend her need for despair. They will never be able to fully understand her, as their existence is a polar opposite to her. Some say that she is the opposite of being a demigod, some say she is nothing but a human whose lover was murdered and now seeks to bring others to her level. Regardless, she has made the mission of her existence to maim, murder, and mutilate.
She cares not why the gods choose to put her in their tournaments of death, only that they continue to do so. Her  humanity long gone, she is now death incarnate, the Soul Reaper, One Who Walks With Death, and many other such names given to her by mortals ignorant of her purpose.
In point of fact, she was once human. Long before the Elders of Aegeis met in council for the first time in the Year of Great Harvest, Enigma was happy. Destined for greatness, she had mastered her fathers teachings in magic by the age of twelve. She could adeptly practice the same spells as those with decades more practice than she.
The next year, she was going to start higher education. She had been accepted as a pupil of the Elders, and was expected to quickly rise as their leader. Unfortunately for her, and for the rest of the world, she never had this opportunity. The Cult of Dominion had seen to that.
As she was running errands for her father at the market, she was approached by an old man seeking some help getting his groceries home. As he led the willing young girl to a dark back alley, she realized something was amiss, and felt the darkness seeping from his frail body. As it turned out, this man was the host for the Avatar of the Titan Dominatus. He pushed her up against the wall, and her essence left her, her body no longer her own. The girl whose name has since been forgotten was now the Avatar of Dominatus, and she would not be easily forgotten.
The Avatar left the market, and returned to her bodies home. She slaughtered her bodies parents. She slaughtered the neighborhood. She went to the Elders, and managed to kill 7 of the nine before the Grandmaster could put her into a stasis able to contain her long enough to figure out what to do. In the end, they forced her into the space between spaces, the non-existence that is emptiness, with the help of the gods. There she burns in agony, twofold because none other may suffer with her, and because she shares her body with the Avatar.
She will hunt you.
She will burn you.
She will take the fears you hold in the deepest recesses of your mind, and paralyze you with them.
You will burn.