Alastor (, English translation: "avenger") refers to a number of people and concepts in Greek mythology:

1. In Greek mythology, Alastor is often invoked as a spirit of revenge against wrongdoers.
   在希臘神話中，Alastor 常常被作為對不法之徒的復仇之靈召喚。
2. The protagonist in the novel felt the presence of Alastor as he sought justice for his family's suffering.
   小說中的主角在為家庭的苦難尋求正義時，感受到了 Alastor 的存在。