The Sword That Cuts Nothing

After being tasked with the quest to destroy nothing (which is somehow a powerful force), Tigtone decides that he needs a sword that can cut through nothing. So he chips and dents his sword until it's so broken down that it can't slice through anything, meaning that it can slice through nothing. The broken sword is now able to alter reality itself and cut through pure nothingness.

Example of:
Semantic Superpower