After killing the dual cyclopes in Things Betwixt, return to the old hags at the beginning of the game. Speak to their handmaid to receive this.
While exploring the Undead Crypt, you'll drop into a room full of ghost knights and undead. One of the corpses in this room holds the weapon.
This is found by the Undead Lockaway bonfire in Huntsman's Copse. Enter the skeleton-filled tunnels and loot the first corpse you see to retrieve it.
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