Who is Fate from On a Pale Horse and what is their importance?

Fate is an Incarnation, like Death, an immortal office that is held by a human soul. Fate is responsible for fate and chance, leading people through the paths of their lives. Fate sees each life as a string, and the string is cut short at the person's death. Fate has three aspects: Clotho, the youngest and most attractive aspect, who spins threads of human existence; Lachesis, the middle aspect who appears as a middle-aged woman and patterns the threats and determines their lengths; and finally, Atropos, who appears as an elderly woman with large, threatening scissors and cuts the threads at the end of a life. Lachesis is responsible for leading Zane to become death, so that he may ultimately defeat Satan. She also introduces Zane to his role as Death.