What was that quote again? Absolute power absolutely corrupts? Something like that.
Anyway, this little artifact might look simple enough, but it should not be underestimated. How it exactly worked is unclear, but what we do know is that it wasn't designed for peace. It could shape itself almost like a liquid, able to change into any weapon the carrier desired.
Not only that, but it absorbed the souls of any poor victim that was killed by it. The more who fell beneath it, the stronger it became.
That's why it was supposed to remain locked up, but alas, it has gone missing... Let's hope it isn't found by the wrong hands.