archenemy

ArchEnemy is a 2009 science-fiction and fantasy novel by Frank Beddor and the third novel of the Looking Glass Wars trilogy. The book was published on October 15, 2009 by Dial Press and is heavily inspired by Lewis Carroll's Alice's Adventures in Wonderland and Through the Looking-Glass.

An archenemy, archfoe, archvillain, or nemesis (sometimes spelled arch-enemy, arch-foe, or arch-villain) is the principal enemy of someone or something. In fiction, it is a character who is the hero/protagonist's worst enemy.