Annabeth's Sword

Annabeth's Sword is a sword made of Drakon bone. It was given to her by Damasen after she lost her knife in Tartarus.

History
When Annabeth Chase fell into Tartarus along with Percy Jackson, she lost her knife, the weapon she owned since she was seven, given to her by Luke Castellan. While wandering through Tartarus she was unarmed and had to rely on Percy and Bob for protection. When Percy was poisoned, Bob took the pair to Damasen where he was able to heal Percy and provide them with a few hours of rest. Before the trio departed Damasen gave Annabeth a sword he made out of Drakon bone. The sword is honed to the edge and has a simple leather grip. The type of Drakon used is a rare breed called 'Maeonian Drakon' because their home country was Maeonia, as stated by Bob.

The House of Hades
When Bob, Percy, and Annabeth arrive at the Drakon Swamp, they come face to face with a ferocious Drakon. Damasen bursts from the swamp and attacks the monster. After Damasen dispossess of the Drakon, he gathers the remains and welcomes the three into his home where he heals Percy and provides them with food and sleep.

While Annabeth sleeps, Damasen creates a sword for her out of the Drakon's bone.

When Annabeth and Percy reach the Doors of Death, she uses the sword to slice through the chains holding the doors in place, and then to defend herself against the army of monsters.