Annabeth's Knife

"... The hero's soul, cursed blade shall reap..."

- The Great Prophecy referring to Annabeth's knife

Annabeth's knife was given to her by Luke instead of a hammer when they first met years ago when Annabeth was only seven years old at the time while Luke was fourteen and Thalia was twelve. Luke made a promise to Annabeth that he would be there for her when he gave her the knife so that she could defend herself from monsters that are chasing them. It is her weapon of choice because when Luke gave it to her he told her that only the fastest and cleverest of warriors could wield the weapon. She is very skilled with the knife, although she has been trained to wield a sword as well. When Luke betrayed her and joined Kronos at the end of The Lightning Thief, it became cursed because of his broken promise. It is also the knife that Luke used to kill himself in The Last Olympian, by stabbing his Achilles Heel (which was under his left arm), in order to kill Kronos's Titan spirit in his body so that Olympus could survive and that the Western Civilization could live on.

The Great Prophecy
It is the cursed blade of The Great Prophecy when Luke had broken his promise years ago after he betrayed Annabeth, Thalia and Percy when he joined Kronos.