Greataxe

 is a Melee Heavy 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 grasp it, sharpening 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.