A piece of iron shaped like a key.
Past the altar deep within the Iron Keep
and through a door is the tower that the
Old Iron King used to produce iron.
The unearthly weight of this chunk of
iron is a reminder of the Iron King's
own immeasurable strength.
Dark Souls II
Granted immediately upon loading the game if the player owns the Crown of the Old Iron King DLC.
Scholar of the First Sin
Found in bottom of the salamander pit in the Forest of Fallen Giants. It is located on a skeleton along with the Rebel's Greatshield, just before the opening leading to the fire longsword.