What was the story of the legend of fate?

The Legend of Destiny was a fantasy and science fiction novel about the conflict and cooperation between humans and extraterrestrial life. The protagonist of the story was a young warrior named Jack. Jack met a witch named Sarah during a mission. She told him a legend about fate. Legend has it that everyone has a destiny that determines the tasks and goals they are destined to accomplish in life. If they failed to complete these missions and goals, their souls would be cursed and eventually lead to death. Jack was very interested in this theory and decided to find evidence to prove the existence of fate. So he began an adventure and met some friends and enemies along the way. They went through many challenges and trials together and finally found a mysterious alien life form. The alien life form told Jack that his destiny was to save the Earth, but the Earth was already controlled by an evil force. Jack and Sarah worked together to use their skills and power to defeat the evil forces and save the earth. After completing the mission, Jack and Sarah found that they had been cursed by fate and had to complete the remaining missions and goals to remove the curse. They finally completed these missions and goals, lifted the curse of fate, and became legendary figures.