ACKS: Keyblade

Sword +2, Keyblade: The wielder of the keyblade can open locks as a thief on a 12+. It deals an additional 1d6 damage against undead. Additionally, while in possession of the keyblade, it's wielder has the arcane dabbler proficiency and avoids a backfire on a 4+. Finally, a keyblade's size and shape may be altered at will.