Weeping Isis (3.5e Equipment)
From D&D Wiki
Weeping Isis: This +1 bastard sword depicts the goddess Isis weeping over the dismembered body of Osiris. If the wielder of this weapon drops a creature and uses the Cleave feat, they may strike the same creature that he just dropped. This strike counts as dropping an opponent.
Faint Enchantment;CL 5th; Craft Magic Arms and Armor, Cleave feat; Cost Cost 4,168 gp + 167 XP; Market Price: 8,335 gp