Leroy's sword was a weapon owned and used by Greek demigod, Leroy. However, the sword proved rather unreliable, as it broke, leading to the death of its owner.
Percy Jackson and the Olympians[]
The Lightning Thief[]
Percy notices it when he first goes into the Attic to receive a quest from the Oracle; the hilt is on a table with a tag attached, reading "This broke and Leroy got killed. 1999."
The weapon does not appear again for the rest of the series, but it is probably still in the attic along with all of the other trophies collected by various demigods over the years.