Soul Edge

The Soul Edge is the sword of Duck the Duck. How he obtained it is currently unknown. It seems to have great power, allowing Duck to hit and hurl a moon in Duck v Run Rematch Galaxy towards Run the Hedgehog, destroying the planet he was standing on. While this was not enough to harm Run, it's fair to say the power of the Soul Edge is at least comparable to Run's Keyblade as the hedgehog was seen using it to defend against Duck's attacks.