Nemesis

(n.) An unbeatable opponent; a source of harm; the goddess of retribution; hence, retributive justice personified; divine vengeance.

Thesaurus Entries

Alecto, Astraea, Dike, Jupiter Fidius, Justice, Justitia, Loki, Megaera, Minos, Rhadamanthus, Set, Themis, Tisiphone, Typhon, avenger, blindfolded Justice, burning rage, furious rage, furor, fury, passion, rage, revanchist, tearing passion, the Erinyes, the Eumenides, the Furies, towering rage, vehemence, vindicator, violence