Arrow of Seasong

You sing a chanty to Valkur, and brandish the weapon used to cast the spell and choose a point within range. Hundreds of similar spectral weapons (or ammunition appropriate to the weapon) and sleet fall in a 40-foot-tall, 20-foot-radius Cylinder centered on a point you choose within range. The area is Heavily Obscured, and exposed flames in the area are doused.

Each creature of your choice that you can see in a 40-foot-radius, 20-foot-high Cylinder centered on that point makes a Dexterity saving throw. A creature takes 3d10 Cold damage on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The Cold damage increases by 1d10 for each spell slot level above 5.