The sword is in Zethes' possession when he, Calais and Khione attack the Argo II. After Piper McLean and Festus defeat the invaders, Piper claims the sword and begins utilizing it as her own personal weapon alongside Katoptris.
Piper continues to use the sword, particularly when she battles the Gigantes Periboia sword against sword with the help of Aphrodite and defeats her. Piper is noted to be the most impressive out of the fighters, holding her own despite Periboia's size advantage.
During the Battle of Half-Blood Hill, Piper somehow loses her sword during the chaos before facing off against Gaea when she rises. She apparently loses it for good as the sword is not stated to be in her possession again afterwards.