Athodal's Aquatic Edge

You rub water on the flat side of the sword you're wielding which gathers and coalesces along the edge, enhancing the sharpness and adding a bitter cold bite.

On a hit, the target takes an extra 2d6 Cold damage in addition to the sword's regular damage.

The blade sheds Dim Light in a 10-foot radius. The light is tinged blue and emanates cold.

As an action you can release concentration on the spell, creating a 15ft cone of cold spray. Targets must make a Dexterity saving throw or take 2d6 cold damage on a fail, or half as much on a success.

Using a Higher-Level Spell Slot. The damage increases by 1d6 for each effect for each spell slot level above 2.