What was the monster Artemis fighting in book The Titans Curse?

In Rick Riordan's *The Titan's Curse*, Artemis, the Greek goddess of the hunt, is not fighting a monster in the traditional sense. She is battling a curse that has been placed upon her by the Titan Kronos.

This curse is a powerful magical force that has transformed her into a mortal girl named Annabeth Chase. This curse is designed to weaken her and make her vulnerable, ultimately allowing Kronos to use her as a pawn in his plan to overthrow the Olympians.

While Artemis is not physically fighting a monster, she is constantly struggling against the limitations of her mortal form and trying to regain her true divine power. This internal struggle is the real conflict she faces in *The Titan's Curse*.