Ethereal Blade
Damage: Ethereal 10 - 30 + Dexterity
Accuracy +15
Cooldown: 4.0 seconds
Weight: 0.2kg
The brightly glowing blade of the dagger passes through solid mater with ease and it even leaves living tissue completely unharmed.
The Ethereal Blade is a light weapon in Legend of Grimrock 2. It can be obtained in the Cemetery.
The Ethereal Blade only does damages to non-corporeal monsters such as the Air Elemental. And presumably the Fire Elemental, but good luck hitting it before it explodes.