Whispers

 is a Melee Light Artifact weapon in Torment: Tides of Numenera.

Description
This carved gray crystal serves as a rough-hewn dagger. The crystal edge looks blunt and harmless... but it sharpens as you grasps it, and sharpens more the longer you focus on the blade. As you do so, you hear a soft whispering sound, coming from right behind your head... but when you turn around, you see no one behind you.

Location

 * Valley of Dead Heroes: Sold by Tantalum.