Dervish Crescent

Sold by Nazramu, a djinn you "pulled" into your world using Spectacles of Spectacle during Zaviak's Vision Quest.

In-game description
"The length of this blade is etched with flames, genies, and whirlwinds. Small glittering particles along its length evoke a sandstorm. The style and quality of the blade indicates it was made in Calimshan."