Shadow Arrow
You weave illusion magic into your arrow, causing it to occlude your foe’s vision with shadows. The creature hit by the arrow takes an extra dice:2d6|noform|noparens|avg (2d6) psychic damage, and it must succeed on a Wisdom saving throw or be unable to see anything farther than 5 feet away until the start of your next turn.
The psychic damage increases to dice:4d6|noform|noparens|avg (4d6) when you reach 18th level in this class.
Sources
Xanathar’s Guide to Everything p. 30