|“||To the last, I will grapple with thee...from Hell's heart, I stab at thee! For hate's sake, I spit my last breath at thee!||„|
|~ Moby Dick|
A "Nemesis" is an opponent or enemy who is created by the actions of a hero within a story or legend.. The name is derived from the Greek goddess of vengeance who would punish people who committed hubris.
A good example of a nemesis would be Grendel's Mother, who fought Beowolf after the hero killed her son.