The ability to generate and manipulate darkness for a variety of effects. Most common use is complete concealment visually from others despite the ability to pierce darkness with visual powers or not need much light to see such as night vision. The location of the individual along with their voice or any other sound is completely concealed.
D displays this ability many times through out the series.
The Gilzen Commission is assaulted by Duke Gilzen under the cover of darkness he manipulates in the brightness of the day time. Under a kind of darkness form that can't be perceived, turns all the Mountain Folk in flight. The group notice they all have the power to walk in the day light despite being Noble. In the mist of their astonishment, Lourié is grabbed temporarily by the Duke who has him drink some sort of concoction. This drink turns him into a living corpse instantly.