Acid Wave

You create a wave of acid up to 60 ft wide, 40 ft high and 10 ft thick. You choose a direction in which the wave travels. At the start of each of your turns beyond the initial casting, the wave wil move 50 ft in the direction you chose at the moment of casting, moving through the space of creatures and stopping upon hitting a wall it cannot pass.

Creatures caught in the wave take 9d6 acid damage and must succeed on a strength saving throw or be moved up to 15 ft with the wave and be knocked prone.

The wave leaves behind a dangerous terrain that deals 5d4 acid damage to creatures that start their turn prone in the area, 1d4 acid damage per 10 ft of movement in the area and 2d6 acid damage to a creature that ends their turn in the area.

Tiny and flying creatures have disadvantage on the saving throw and huge or larger creatures ignore the strength save but take an additional 3d6 acid damage.