Duskbeam

A beam of shadow blasts out from your hand in a 5-foot-wide, 60-foot-long line. The line becomes shrouded in 10-foot-tall magical darkness until a new line is cast or until the spell ends. Each creature in the line must make a Dexterity saving throw. On a failed save, a creature takes 6d8 necrotic damage and half as much damage on a successful one. Celestials and fey have disadvantage on this saving throw.

You can create a new line of darkness as your action on any turn until the spell ends.

For the duration, a tendril of gloom meanders about in your hand. It makes the immediate surrounding 30-foot radius dimly lit.