Rob Lucci,[1][12] also known as Massacre Weapon,[6] is a masked agent of CP0.[3]Originally, he was introduced as part of CP9, reputed as the assassin unit's strongest member in history.[13] Operating undercover to obtain the Pluton blueprints from Iceburg,[4] he worked as a sawyer, treenail, and bolt specialist for the Galley-La Company's Dock 1 in Water 7.[1]After his defeat by Monkey D. Luffy at Enies Lobby, Lucci was dismissed from CP9 by Spandam, who declared him and the other assassins responsible for the Straw Hats' havoc on Enies Lobby. However, within the next two years, he managed to be reinstated into Cipher Pol as part of CP0, this time as Spandam's superior.