Jsk Wondrous Items:Dragonblood Weapon

Source: Jnome's Secret Knowledge

Weapon (Any), Uncommon (Requires Attunement)

A metallic dragon scale of unknown material. When a creature first attunes to this weapon, it takes the shape of any simple weapon or martial weapon that the owner wants. The weapon is a dark, burnished gold that is engraved with draconic runes. The length of the weapon has a deep line that starts where the weapon would be held and ends at the tip or end.