Tidal Blast

You conjure up high-pressure water on a point on the ground that you can see within range. It swells up into a powerful wave that moves horizontally in a direction of your choice. All creatures in a 10-foot wide and 60-foot long line starting at that point must succeed on a Strength saving throw or take 4d6 force damage, 4d6 cold damage, and be pushed back 30 feet in the direction of the wave or at the end of the line, whichever is shorter. On a successful save, a creature takes half as much damage, is only moved 10 feet, or until the end of the line, whichever is shorter.

Using a Higher-Level Spell Slot. The damage of both instances increases by 1d6 for each spell slot level above 4.