Star-Touched Blade

This dagger is seven inches long and has a broad blade with a sharp curve at the end, much like a jambiya. The metal of the blade is a deep purplish-black, and seems to glow faintly under starlight, while the hilt is a simple arrangement of wooden scales wrapped in somewhat tattered leather.
It was found embedded in an enraged earth elemental, and seems to have been the source of the darkness that befell the Infested Farm.