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. When this weapon is used with the Cleave feat, the wielder may now choose to strike the same creature that he just downed. This strike counts as downing 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