Yakhsi, a blade of historical significance. Wielded by Aziza.

(attempt 2)(this is a little closer to how I imagine it)

In the world I am building, this sickle was used by a rebel god in ancient times to castrate his father, the god of the sky, so that he might not produce more gods. The organs turned to sand and fell to a place on the edge of the Pit of Hell and became a great desert. This desert became the home of the rebel god afterword, and he made it his own world. To the people of this desert, this sickle is one of the most sacred objects in existence, and has been wielded by great heroes throughout history. This sword turns decapitated parts and defeated enemies into sand. It is light as a feather and is capable of releasing sharp gusts of wind when it is swung. The reason the blade is floating above the sand is that its blade is of an aerial nature, and is not capable of touching ground.