In the mysterious realm of Mortis there exists a trio of beings able to wield the Force in ways no known mortals of the galaxy can. The Father maintained balance between his Daughter and his Son, who expressed affinity to the light and dark side of the Force, respectively. The Father knew his days were numbered -- facing his impending demise, he needed to find another to keep the balance. His goal was the same described in an ancient Jedi prophecy -- the rise of a Chosen One who will bring balance to the Force.
The Son was an embodiment of the dark side of the Force who dwelled on Mortis during the Clone Wars with his sister, the light-sider known as Daughter, and the powerful Force user known as Father, who tried to keep them in balance. Son sought to escape Mortis and wreak havoc in the galaxy, trying repeatedly to lure Anakin Skywalker to the dark side by changing form, possessing Ahsoka Tano and finally by showing Anakin a vision of the terrible acts he would commit. His efforts ultimately failed, culminating in his death along with those of Daughter and Father.
Discovered as a slave on Tatooine by Qui-Gon Jinn and Obi-Wan Kenobi, Anakin Skywalker had the potential to become one of the most powerful Jedi ever, and was believed by some to be the prophesied Chosen One who would bring balance to the Force. A hero of the Clone Wars, Anakin was caring and compassionate, but also had a fear of loss that would prove to be his downfall.