My submission into the contest, a blade as powerful as the name it bears.
Faustus Scythe
"4242564"
    Long before the Gungeon existed, there were powerful beings that ruled over the universe with gunmetal fists. These demigods have long since been erased from known history, and the only evidence of their existence comes from the powerful weapons they left behind.

How does this work? I've imagined this as the counterpart to Blasphemy, slightly more damage, longer range, but somewhat slower, and it doesn't have Blasphemy's projectile ability. To make up for this, it can be charged then fired, sending a spinning blade of death that deals more damage at a faster rate, and destroying most projectiles, but while in this state, you have no weapon! While waiting for it to come back, you can hit the reload button/fire button to play a short whistle and the scythe will home in on you, and you'll be able to catch it and start using it again. If that sounds super complicated, then you're right!

EDIT: apparently the problem with the previews is not my fault, but the site's, just click on the preview and it should work