Excalibur

The Excalibur is the mightiest sword in all the realms, powerful enough to vanquish any enemy.

Before the Curse
To boost Snow White's confidence about facing the Evil Queen, Prince Charming constructed a fake version of Excalibur and planted it in a stone. When Snow pulled it out, believing it to be the real one, she was able to overcome the Queen based on this belief. Rumplestiltskin later destroyed the sword to prove that it was fake, and Snow is made at Charming for lying to her. They make up, however, when she realizes that he did it to help her believe in something he already knew.